I don't know anything about the hermie part as far as whole plant vs one branch but I do know that I have broken off more nice branches on my plants during flowering than I would have liked and never had a problem with the plant after that...they just picked up where they left off and kept growing. If you can't bend it then I wouldn't hesitate to trim it back if you need to (assuming of course you don't have other problems going on, bugs, mold etc.) Obviously you have lost the main cola but the bud underneath will hopefully pick up a little once they get more light. Good luck.