You are thinking only about 0 and 1 solutions, why not something more ‘greyish’. I think he might be concerned about other stormtroopers. Even if not thinking about helping them out, he could partly identify with them - hence have some problems with mindless killing them (maybe more like leaning to the wall because he…

Partly yes, but on the other hand He should know exactly other stormtroopers situation - cuz he could be one of them there (heck only because he snapped he wasn’t one of them). So i would like him to be more reluctant to shot them. Something like “I don’t want to kill when it’s not necessary”, maybe without so messiah…