He TOUCHED his arm...touched. I'm not sure on what planet he grabbed it and yanked it back, but not on Earth. It was some good, tight coverage and that's it.
If you watch that arm, it was never affected by the touch.
You clearly have not watched the Bronco's. If you cast a shadow on any of Manning's receivers it is pass interference plus a major and 5 minutes in the penalty box. If you actually touch them sharia law comes into effect and they start by lopping off a hand and get more and more extreme with each 'penalty."
Apparently this came with Manning from Indy, and his agent included it in the negotiations for his 90 million. Manning and the refs for a mere 20 million a year, not bad.