Snowman - not really a hijack, it's to the point. Yes, if you release the ball in the downswing, like a plane going nose-first into the runway, it can cause the ball to double bounce. Another cause can be a bowler getting low enough so that the ball touches the lane at the bottom of the swing (1 thump) and then release the ball slightly upward and out onto the lane (2nd thump).
--------------------
J.J. "Waterola Kid" Anderson - "Better than Jello" - Kill the back row
Edited on 7/14/2009 2:24 PM