The moment a group that size actions violently, I'm going to start unloading my gun for real. They very, VERY likely started the assault part early on, as they were boarding the train. That's the usual style of a "wolfpack attack".
In that event, based on what I've seen and studied regarding that sort of attack, yes, I'm prepared to kill minors. That's a pre-set decision: mass attack, serious counter-attack.
In that event, based on what I've seen and studied regarding that sort of attack, yes, I'm prepared to kill minors. That's a pre-set decision: mass attack, serious counter-attack.