So I had a squad of 2 grotesques that were fleeing (2/4 so not "insane heroism" yet). I also had 2 Haemonculi nearby. Could I have the Haemonculi join the fleeing squad to give them a good LD save, but would that cause the Haemonculi to start fleeing? Do i get to make a LD save as soon as he joins them? How would that work if it's possible.