Over on AT, there was a thread demonstrating how your nock slips if you don't shoot a loop. Poster pointed out the video on Limbsaver's site and that proof is in the video for sure. Take a look: http://www.limbsaver.com Click on "Nock Travel Video"
As a side note -- You blazer fans might want to check out how those blazers flap like a duck blasting off the water!
FOBs Frickin' RULE!