Face Guarding

[KS_Blue]

I know face guarding is not defined in the book, but I hope you all know what I'm talking about. How do you guys determine whether a defender has face guarded or not?

Reason I'm asking is that last Friday we had a deep pass to A1. A1 is being guarded by B1. B1 is facing A1 and as the pass approaches, B1 raises his arms so his palms are facing the pass, and he looks straight up, kinda like a Willie Mays catch. As this is going on, B1 also runs into A1, so we have a flag for DPI. This got our crew into a discussion after the game, as to what we thought was face guarding. The veteran in our crew said you had to look at the hands, meaning that if his palms were facing backwards, he was ok. He also said that if he knocks the pass down, it is not a foul either. I did not agree with him, but thought I'd see what you guys thought. I think it has more to do with whether or not he is looking for the ball.