You can't call interference without contact, and the contact occured AFTER the ball hit Newman, so pass interference did not apply.
As for "faceguarding", don't hold your breath waiting to hear an official make that call. You wont hear it - there is no such penalty.
The only application for what you call "faceguarding" is when contact is made. If contact is made and the DB is facing the ball and making an attempt to catch it then it is incidental contact and there is no penalty, but if he makes contact with his back to the ball then it is pass interference (not "faceguarding").