^The referee got it wrong. It was not a professional foul as it did not deny a clear goalscoring opportunity. It was barely past the halfway line and there were two covering defenders. It's a booking, tops. Every defender in the Premier League will do the same thing once or twice a season.
If they're saying it's violent conduct then that is a joke, the FA are comedians and should be performing at the Edinburgh Festival, not running the country's most popular sport.
As an Arsenal fan who has seen the "let him know you're there" type "defending" the it's grim oop north defenders playing for the likes of Bolton and Blackburn get away with, calling that violent conduct is not even funny, it's an insult.
Referees have to earn respect first.