He should have expected the grab, but it still manages to catch him off guard, the sudden violence of it startling him enough that he does in fact stagger to his knees. His cry is a little bit from the pain but much more from exasperation.

"You are insufferable," he snaps, and seizes her upper arm with his free hand. He doesn't want to damage her body in case Fred is still in there, capable of feeling the pain, but he is firm in pushing back, climbing to his feet and attempting to shove her away. "Why do I even bother trying to help?"