Two companions died, and while I couldn't select them or give them orders they kept on fighting. After remaining companions fell fail screen appeared. It happened once before in the same playthrough with the rogue character. Can't figure out what is the cause for it, didn't give them special orders, it didn't happen on conequent attempts.

While we are at it, one of the enemies (the monk) seems to be still incomplete being invisible (character model, clothes are foating) with his name being "Missing String 888" or something like that.