C
She is bigger but she doesn't take him as a threat, underestimation is the one thing he always has on his side as well as the fact that after swimming, constant playing and chasing little critters has made him muscular and great at pouncing. He will not ultimately win against her, in fact it could be a very early death unless he gets away xD. Also, I was aiming to make a move that overall starts the war, that is sure to come from the rumors about the alphas killing each other. Charlie is normally pretty cool about these things and if she has a problem with something I can always change it.