"This is not the truth. If you don't question it, then trying to convince you is pointless."

When Buttercup pulls her knife out, golden ichor drips down its blade. Buttercup isn't even granted the satisfaction of a yell of pain. Thanatos just tries to take a hold of her again.

He won't grab her wrist. He'll never grab someone's wrists. However, he will try to pull her up into the air, flapping his wings hard, and hoping that the change in elevation will give him the advantage. From there, it'll be flying Buttercup over to the evacuation spot.