Best thing you can do is just do things completely different than what you were doing before to see if you can force the ai to react. So instead of one shoting one of the mobs try to intentionally kill one of your characters or something to see if that triggers the ai to do something new. Otherwise I would hope you have more than 1 save from the past 4 hours. In games like these it's paramount to save a lot because there're so many complex systems going on you have no idea what could go wrong. By the time I was done at 150 hours I think I had like 3000 saves lol.