Rules Question

[Rock Solid]

It is the last play in the game. It is overtime. The offense and defense calls set. They run the board. It is a pass. The offense goes to pass and suddenly points out that they ( the offense ) have three guys in the endzone. The play meanwhile is from midfield going the other way. So they are not in play so to speak but they are on the field and not on the sideline. What do you call ?

The play will determine the winner if the pass is completed.

RS