Just make the prompt abit more...complete after a conver :)
the creatures were being blackmailed by Grindelward to attack people (or the good guys in this case? The British/Amercian aurors?) with Newt, and the creatures allowed it because they couldn't save Newt by themselves (either because Newt was seriously injured, or actually killed by Grindelward at this stage)/ they were being promised that Newt's body will be returned/Newt will be resurrected......that they love Newt so much that they allowed themselves to be controlled this way......and at the end they found a way to stop Grindelwald......"
Re: Grindelwald/Newt, Graves/Newt, Newt's creatures Blackmail
the creatures were being blackmailed by Grindelward to attack people (or the good guys in this case? The British/Amercian aurors?) with Newt, and the creatures allowed it because they couldn't save Newt by themselves (either because Newt was seriously injured, or actually killed by Grindelward at this stage)/ they were being promised that Newt's body will be returned/Newt will be resurrected......that they love Newt so much that they allowed themselves to be controlled this way......and at the end they found a way to stop Grindelwald......"