Could a reciever stop the clock by throwing the ball OOB?

[train.]

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While we're talking about rules, a possible hijack. IIRC there can't be more than 11 men on the field, but there's nothing that states there can be less. Is there anything to stop a team lining up with something like one TE, a WR and slot player on the weak side, QB and RB to make ten, leaving one side of the field open, then if the cornerback moves away, have a wideout subtlely come onto the field before the snap on the strong side for a quick WR screen and easy yards? If legal, a variant would surely be cash money in a goalline situation when you're showing an obvious run.

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Not sure about NFL, but in college isn't this illegal substitution? I think you have to break huddle with all the players for that play in the huddle, if someone runs onto the field after the huddle breaks it's illegal sub.