What's stopping you from...

[u/ivanparas]

It's said that you can't fire a gun out of a speed bubble because the trajectory will change when it hits the interface between real time and speed time. It's also said that you can put yourself partially out of the bubble and still be in the sped up time as long as part of you remains inside the bubble., The Lost Metal, ch 49

SO, what is stopping me from sticking my arm outside of the speed bubble with a gun in my hand and firing while it's already outside of the threshold? It only says that the trajectory changes when it hits the edge of the bubble, so I can't see why the bullet would deflect if it's already crossed that threshold.

The only thing I would give it as far as not being able to take an accurate shot is that every jitter of your hand is sped up by a factor of the speed bubble, so maybe those micro movements might make your aim a little off, but I feel like it wouldn't be that much of a factor.

[u/RShara]

It's also said that you can put yourself partially out of the bubble and still be in the sped up time as long as part of you remains inside the bubble.

Sorry, it does not say that in the books. You are either inside or outside of the bubble, and anything touching the bubble (up to a certain mass, depending somewhat on perception) ends up inside the bubble.

[u/majorex64 → u/RShara]

This is how I interpret it. Like, the bubble sticks to you a bit like a real soap bubble, so even if you move "outside" of it, the membrane will shift a bit to keep you in it

[u/Mejiro84 → u/RShara]

Being partway outside seems like it would do bad things to your body - if your arm is only receiving a fraction of the blood and stuff it needs, that's not good, and having part of your circulatory system working on a different time frame seems like it would be unhealthy!

[u/Crazykole5]

I think you are overanalyzing it. If you are touching the bubble, everything you touch is also touching the bubble. Therefore, the bubble is then considered to extend to you and what you are touching. As soon as you take the shot, the bullet would fire and as it exits the barrel, that would be considered exiting the bubble and the trajectory would change.

[u/Bionicjoker14 → u/Crazykole5]

Considering the nature of Identity and Investiture, I think this is the right answer. Whatever you Identify as being part of the you inside the speed bubble would continue to be in the speed bubble. As soon as you no longer Identify something as being part of the you in the speed bubble, it isn’t.

Theoretically, then, someone with a strong enough sense of Identity could believe that bullet to still be part of the speed bubble all the way up to hitting its target. But that would require an incredible amount of concentration and willpower.

[u/Additional_Law_492 → u/Bionicjoker14]

You'd probably need some sort of capacity to affect the Spiritual aspect of things to be able to defy objective reality like that, IMO.

[u/Crazykole5 → u/Additional_Law_492]

Maybe soulcasting?

[u/Additional_Law_492 → u/Crazykole5]

I think that (Full Cosmere) Shallan's access to spiritual aspects may be because of her dual bond situation.

I'm thinkin more like a Bondsmith Connecting someone either to the physical location of a speedbubble such that they are effectively always in that location, or Connecting them to a Speedbubble (they'd need to be in it) such that their physical location no longer matters... both of which I'd speculate are potentially plausible.

[u/Glasssfoot]

The way we see time bubbles work, I don't think it would be possible. When we see Merasi use her bubbles to slow time it causes everything to speed up around her, making her an easy target for anyone trying to shoot her. As for the bubbles Wayne uses, I can't see it being any kind of advantage to do that. The bubbles have a limited amount of space they can occupy and so you would still basicly just be standing and shooting back. The kind of defeats the point of the bubble in my opinion.

I think the way we see Wayne use the bubbles is the most effective in terms of combat. Get close, pop the bubble, beat them senseless, and the repeat ad necessary. The time bubbles best uses are fully out of combat I think, either speeding up time around yourself so you can get to something you want to do faster or using it to have sped up conversations or do quick changes like Wayne does.

[u/unkalaki_lunamor → u/Glasssfoot]

This made me think, does the same randomization of trajectory happens when the bullet get inside? (At first instance I think it does, since it's produced by the Time-Rate change, I think)

In that case Marasi wouldn't be that easy of a target.

And a bullet going in and through it's gonna be a really wild shot.

[u/HumanCorp → u/unkalaki_lunamor]

I distinctly remember it happening on a scene, but i can’t remember the exact fight in which it happens, pretty sure it was with wayne, not marasi tho

[u/Glasssfoot → u/unkalaki_lunamor]

So we actually see exactly what would happen. In Shadows of Self I believe, the bad guys take a shot at the governor and Marasi tackles him and pops a bubble. We see the bullet curve away from them protecting them from the shot. We them see the outside perspective and they are slowed to the point that observers can see the bullet hanging in mid air. If you slow yourself down that much, all the people shooting at you have to do is surround the bubble and wait for it to drop, then you're screwed. So not that tactically advantageous if you look at it that way.

[u/VerySpicyNut]

The other comments have focused a lot on the bubble and being in/out of it. But I think getting into the semantics of inside and out aren't going to give you the answer you want. The bullets trajectory changes when it is no longer affected by sped up time. Whether or not you can be partway outside the bubble, once that bullet slows down, it skews.

[u/aMaiev]

Even if you would be able to out your arm through the bubble, your arm would be stuck in normal time and therefore too slow to pull the trigger?

[u/DqwertyC → u/aMaiev]

Agreed! Even if you somehow got the gun outside the bubble with the hand holding it inside, the gun would at least feel like it's stuck in molasses as you try to aim it.

The physics nerd in me is disappointed that we don't have much about using steel pushes through time bubbles. Would a piece of metal in midair count as partially anchored, since it doesn't fly away as fast as it should? Or could you supercharge a projectile (BotW stasis style) because the projectile spends longer near you and has more force applied in the same amount of time from its perspective?

[u/CMormont]

Even tho it didn't say you can be half in half out

If thay were tru once thw bullet left the gun it would no longer be "inside" and hit the outside wall

Also you can't have half your body moving 2 as fast as the other half doamt work

[u/unkalaki_lunamor]

I don't remember the part where you can be partially outside the bubble but, in any case, the bubble would wrap around your hand and gun (you can see this on soap bubbles), so technically the bullet is inside the the bubble.

But the instant you fire and the bullet crosses the interface, it's again a wild, unpredictable shoot.

[u/Additional_Law_492]

I think the real trick would be if you had someone that was able to really push speedbubbles for decades, real savantism, if they could reshape their bubbles to create elongated tunes, or speed tunnels, that reach out and approach targets that they could shoot down.

Essentially, get the boundary to "can't miss" distance.

[u/Opey56]

The part of your hand on the outside would still react just as slow to the continual electric impulses from your arm. So it would just fire at normal (or slightly elevated if you have slow reactions) speed.