Children were always tricky. You couldn't talk to them or feed them potions, not when they were in this state, and even then it was hard to calibrate the dosage. So John was left with his magic and experience.
Methodically, he fixed the wounds, and checked that he hadn't missed anything, and finally, he cleaned the child up, before moving closer to Theo. "He'll be fine, but he's scared. You should hold him."