They find Graves alive. He's hurt, he's been tortured. But the thing that worries them the most is the strange plant like thing wrapped around one arm. It turns out this is supressing his magic. If he tries to use magic it hurts him. If someone else tries to use magic on it or him, it hurts him (Tina didn't need to ever hear a person scream like that). Turns out apparating with someone with this thing on them hurts them so much they pass out.

The healers can't do anything because the spells and potions will only hurt him. So they call back Newt, who may be the only person in the world that knows what this thing is and how to remove it.

Lots and lots of hurt/comfort. Long, slow recovery under Newt's care.