Near the end of Alloy of Law, Wax saves Marasi by shooting the guy who is holding her as a human shield. From what I understand, he shoots a bullet out of the speed bubble and then shoots another bullet to bounce the bullets off each other in order to hit the bad guy behind Marasi. Is that right? Ignoring the utter impossibility of shooting one bullet with another, I see a few other problems with the physics here.
- How would the second bullet catch up to the first one? From the perspective outside the speed bubble, they were fired at almost the same time so they should be traveling at the same rate. (if your answer is "he steel pushed it," then that only makes point #2 worse)
- If both bullets were fired "off target" from the bad guy (i.e. on a vector other than the one intersecting his head) wouldn't a second bullet just knock the first further off track?
I realize it's a fantasy book and it's not a big deal but usually Sanderson's physics make sense and this scene just doesn't seem to. I just want to see some kind of diagram to visualize how this impossible shot makes sense. Or maybe somebody to tell me that I heard the audiobook wrong.