I’m gonna go with my speculation. The assassin kidnaps Qiao’er for her adorableness and becomes a protective mama/papa bear and live happily ever after. 😂😂
I pick A, but in the literal sense rather than the figurative. He's literally going to be struck by her, and the pain of being hit by that thick head of hers will be too painful and he won't be able to follow through with the assassination(or much else, for that matter).