Prior, we have to seek to do what G- commands us to, without being more “righteous” than Him
Invariably, such things, when they happen, do so on the spur of the moment. No one, when a grenade is thrown into a room, is going to reach for his Shulchan Aruch to see if he should jump on it. Either someone will heroically sacrifice himself or else he will flee.
Yes, you can say “well learn the halachos before the situation arises.” However, I find that (a) most people prefer not to learn about such things and (b) I would hardly be surprised to find that cases vary so much that it may be difficult to formulate a general rule.
The Wolf