So there was no Grindelwald, instead the MACUSA figured out that Credence is the Obscurus and arrest him. They view him as too dangerous and order his execution. Graves, who maybe brought Credence into the MACUSA himself thinking it would help, feels really guilty and recruits Newt, who had been wandering around New York causing trouble, to help break Credence out. Of course afterwards Graves and Credence have to go on the run.

Bonuses:
- Credence is amazed someone would throw away their life and career for him
- it goes as far as Credence being brought to the execution room, but auror can't remove any happy memories to entice Credence into the pool
- Graves and Credence have to stay on the move so the MACUSA doesn't catch up to them - maybe they travel with Newt or stay in contact with him and Credence sends him these letter "dear mr scamander, we have found this nundu with thorn in his paw, how we will help him, please, mr scamander. love, credence
- Graves can't stop being an auror on the run and keeps beating up bad guys and that's how MACUSA track them. "Damn, someone broke the elf trafficking ring in Arizona and left them all tied down in the lobby of local auror office, it has director... I mean to say Graves' fingerprints all over ir. I suppose we MUST really go after him this time.
- Graves can't himself and sends performance review of the aurors chasing him and credence