unless he initiates the body contact. On this play body contact is initiated by the WR fighting back for the ball.
Please keep in mind, I'm looking at this in context of how the rest of the game was called.
You wouldn't want to see me as a ref, I'd be flagging PI on one side or the other almost every play until both sides started playing cleanly.
For the most part WRs in general get away with way more PI than defenders do...I'd shut that shit down. lol