My guess is that the QB will be under pressure if he is running across the LOS and back. It would be likely that he will be close to being hit when he throws it. It might be a case of close to a late hit because he has been a runner for most of the play and, therefore, protection of the QB would be an issue here.
As for the poster who questioned the interpretation, I'd say, "Show me the rule that prohibits this."
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