Do you think he could kill her? She's such a tiny thing and she does play rough with him. Maybe I could trim her claws a bit? I don't mind if he corrects her but he has big teeth and a strong jaw. Would he try to kill her? Or am I overreacting? He did it once and she hid under a footstool for awhile until he calmed down. He has a very bad temper and occasionally tries to bite me too but I spray him with the water bottle when he does it to me. Now I only have to pick up the water bottle though, usually.

He weighs ten pounds and is very strong, she weighs one lb.
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She's getting strong too but is still a little waif of a kitten. If she were a bit bigger I'd just let them settle things on their own terms.