So I discoverd something quite by accident and i think it might qualify as a bug.
So the True Sons AI is hard scripted to do flanking manuvers which can make them really hard to beat at times.
However I discoverd that if you stand by a doorway you can simply just stay there and wait and then kill them one by one as the desperatly tries to rush through said door in a effort to flank you. Now as a Division veteran i understand that flanking is very important but to have the True sons be so hard wired to flank opponents that they will run though a door which they know your guarding one by one might not be the best idea.