I'm not sure but I think bully talked about people killing their baby so they could go back to their old lives (True story from Bulgaria.)
About the hostage situation I will always try to have them both alive. But if that's not possible I would probably kill the 'bad guy'. The problem here is that you can never know if there is no other way. You are not in his head and don't know if he will do it regardless of what he sais or even if he threatens her he won't do anything. A year ago the sister of my girlfriend (by that time) was caught hostage while she was travelling on the bus from Sofia to Varna (6-8 hours drive). The guy who took them hostage didn't mean to hurt them. He just wanted to be heard by our government about what he had to say and after years of useless trying to get the media or someone else's attention he couldn't think of anything but this. So you can't be sure and don't know what is going to happen, but even if you know that he'll kill her and if you kill him instead you will be judged, because you didn't follow the orders to stand down.