How to use "crashing" in a sentence

As I fall, I look up and see the boulder crashing towards my head

We were watching a man who was crashing through a window in a film fight, when a man walked over to us

He was standing on a rocky seashore, with gray waves crashing in

The legs at the foot rose three or four inches before crashing back into the casters, that had been put under them to protect the carpet