His jaw dropped when the door swung open under the blow.
He went down under the blow across the back of his neck.
He ducked under the blow, and the momentum carried her on to the bed.
The door shook again under the cracking blow of his fist.
Blood flew and he felt the nose crunch under the blow.
The door moved under the blow, but not very much.
The roof had given under the blow, and sagged in.
Hawk actually felt the bone of his skull give under the blow, and then the world went away for a while.
To his surprise, the dog did not wince under the blow.
I tried to duck under the blow, and almost made it.