The context of the following conversation is Alex fell out of the tall tree and heard a loud crack when they hit the ground.:
Alex says I am on my way to the hospital. I think I may have broken my arm..
The friend responds What were you doing?.
Alex responds You know I like climbing trees. I was sitting on a branch and fell..
The friend responds I keep telling you to stay out of trees. You are too old for that..
Alex responds I know that now. I heard a crack and my arm is killing me. I think it's broken..
The friend responds Let me know when you know more. Call me if you need a ride home..