Its about the time in which he moved that meter. We have no evidence that he moved that meter by the time the fist moved 1cm, we only know he moved a minimum distance of the width of the fist.
Assuming that the fist could've fully extended before B moves the one meter is inherently more assumptitive than just assuming they end their movements at the same time. You have to assume that off panel there was some further movement after the fist has completed it's movement, which is completely baseless when we just see their end at the same time. Why wouldn't I assume they occur in that same timeframe?
Yes, and because we have no evidence it was fired when her arm was directly infront of her we would have to assume it was fired when her arm was at the guys arm, which would make the movement 90 degrees (ISH)
We see him aiming the gun and preparing to fire the trigger whilst the sword is in front of her and she hasn't even begun a swing. He fired the gun in that instance (or at the very instatntly). Assuming she swung before he fired in this instance is assuming he didn't fire immediately even there is entirely reason to assume he fired at the same time Emily began her movement. 180 is more justified than 90.
Particularly hard to tell, but in a case like this, where the bullet path is already there and the scan shows the full complete movement, it'd be more or less where the blade cuts through the arm (Half-way point) and there's no trajectory change for either the muzzle flash or the bullet.
I take it that the full movement is shown because the swing and the firing occur at similar timeframes, and the panneling seems to support that, as we see the gunman about to take his shot before Emily has even swung. There's no reason to assume he fired mid swing, when we see that he's shooting before Emily has even moved.
The trajectory change happens when Emily cuts the guys gun. If the swing happens after the guy fires, the muzzle and bullet themselves wouldn't go downwards due to Emily's slash, which is what we see.
90 degrees is inherently worse as an assumption as you'd have to just disregard the panneling of the scene in order to say the bullet was fired mid swing, when the gunamn is shown taking his shot before Emily's swing. Assuming they begin their movements at the same time is less assumptitive than not doing so given the evidence. I understand 90 degrees is a lowball, one i'm willing to accept if it get's accepted by staff and CGM's.
To compromise here, I think we should add 2 ends. 1 with 90 degree movements, a high end with 180. I believe 180 has more backing and is less assumptitive than 90, but we can let other CGM's pick that.
Edit: A further issue with 90 degrees is that it assumes this guy fired the gun whilst his arm was being sliced off, which is kind of ridiculous.