[KWH]

Since their were no defensive fouls on the play and the reciever that was participating illegally did not catch the ball it is real easy to sit back and say I pass on this one.
But lets not make this a rule to ignore it...

Because,
1) If the reciever who went out of bounds voluntarily catches the football and advances (or scores) you must have a flag for illegal participation to offset the illegal advance, (or score).

2) If any defensive foul occurs at any time during the play (including DPI against the offensive reciever who went out of bounds) you must have a flag for illegal participation to offset the fouls.

Lets say the QB never throws a pass but instead runs the ball in for a score. Where is the spot of the foul? Who is responsible for keeping track of the spot of the foul? Are you going to ignore this foul? Do you think you could sell "I didn't see it coach" to the team that just got scored on?

I wouldn't make a habit of ignoring this one, and if either coach see's it AND you see it, (and you can bet your paycheck that somebody within the team box saw it) you had better flag it, that is if you want to maintain any credibility. You might get away with it once, but to make a habit of ignoring this penalty might be foolhardy and a bit askew.

Now that I have stood on my soapbox and said all of the above lets talk about the reality of advantage/disadvantage football. If I were the LJ and nothing happended other than a little puff of chalk by a wide reciever, an incomplete pass by the QB, and no coaches screaming about a player going OOB, I might decide to pass on this one.