They find him near the willow, pacing in his animagus form.
Theo stops short, weary.
She's less hesitant, "we're here to help."
Black growls.
"No, really." She calmly reaches into her jumper and pulls out her Time-turner. "See, I have a plan."
Black instantly morphs, snarl on his lips. "You said I die," he spits, "Bella kills me, and Harry is left alone!"
"In one future," she stresses, "but if you follow my plan..."
He shakes his head, "you're thirteen."
"Yes."
"A child."
"And?"
The seconds stretch on.
"I kill Pettigrew," he demands.
A nod. "Deal."