My son sucked up a rock at low idle and not knowing he hit the throttle and it cavitated. He then proceeded to hit reverse and then tried to go again as I finally got his attention to stop I heard the rock come through and seemed to run fine. He parked and is now scared to death he has messed it up. I took it off the lift and just ran it a little still seemed good so I hit it hard up to 60mph and it was running fine. Do you think I need to be concerned or did we get lucky! Thanks!