conina push rincewind

They were about three feet from the far end when Rincewind felt a movement in the air above him. Conina struck him in the small of the back, shoving him forward into the room beyond. He rolled when he hit the floor, and something nicked his foot at the same time as a loud thump deafened him.
The entire roof, a huge block of stone four feet thick, had dropped into the tunnel.

Sourcery, pg. 221