Post-movie search parties go out to find the real Graves. Somehow Newt ends up being the one to find him-- badly tortured, bleeding, starving, just barely hanging on to life-- and because of Reasons™ they can't apparate to a hospital and help can't apparate to them.

So Newt has to sit and comfort/reassure Graves while help arrives the no-maj way.

Bonus points for Newt cradling Graves in his arms and maybe even petting his hair a bit (hey, it helps calm some injured creatures, so it should work on humans, right?).