His eyes widened and he shook his head in outrage "No! That's mine! Give it back!! It wasn't a present!" He wasn't going to attack her, but he wanted his damned dagger back, it was his, and was the only thing he had as protection (or to entertain himself with). In a swift movement both hands reached to try to grasp at the blade's hilt. He didn't do so in an aggressive manner, he just... wanted it back.

"Return it to me! I can't promise to what you asked! Give it back!!" his more childish side was really showing at this moment.