Come on Jane don't get like Adam please, imagine the situation: someone is holding a gun on you and tells you to lie down. Perhaps you comply because you think they are a just a petty burglar after a bit of cash, but would you if you knew you are going to be shot dead?
You would either run or fight there is no other option.
Come on Rob, if your terrified father woke you up in the middle of the night to tell you your schizophrenic sister had gone mad with a gun, would you instantly dial 999 and get over there or waste 20 minutes calling your girlfriend and thumbing through a phone book?
This case is really easy if we just use hindsight to judge the most sensible course of action for each of the protagonists.
NB? - would have dialled 999 rather than useless JB
June? Would have gotten out of bed, not lay there waiting to be shot...