That is the PH's gun that is locked up. It's not jammed it's locked, he can't get the bolt open-unlock.

It also appears as he is trying to unlock-open the bolt it fires off into the air. That could just be an illusion from the poor video quality.

Clients rifle appears scoped.

That close doesn't seem to be a time for crossed sticks. The client can't swing as the rifle is held in by the sticks. The client has to move his feet/whole body to swing.

It real safe for us to sit here and second guess, however. We weren't the there to see what happened-really.