On the one hand, there is this rule outlined in the article:
"It depends on whether the tackle slings his arm up there as a last-ditch effort to keep Harrison from getting to the quarterback (illegal), or if in the process of Harrison's rip move, he gets beneath the tackle and under the arm himself (legal)."
...which kinda contradicts the quote from Harrison:
"The ref told me if he has his arm around me on the front, and my feet are past his feet, then that's a hold," Harrison said. "We'll see if that works, if that's called."
The Saga Continues...