I'm not sure what you are asking?
You mean the Ammo Blows, destroying the torso, but the ammo triggered Crit Hits when it did & so now you roll 1 section inward?
I don't believe that is how it works.
You have to start the turn/phase w/o any crits locations to have them move inward.
So the ammo exploding is still in the same phase so while you DO get to roll them in case there is MORE ammo to blow up causing added pilot hits, but, if you end up w/ 4 Crits in a location that only started w/ 3 slots filled that turn, the 4th wont transfer, its just lost.