I think that's the most likely reason, serious foul play.
ETA having re-read Leo.....'s post about the ref saying it was violent conduct and the reason he, apparently, gave, I think that seems a better explanation. If Parry was going for the ball it could be serious foul play, but if he isn't then that would make it violent conduct. I think it's a decision which could have gone either way and Parry might get it downgraded to yellow if we appeal. Perfectly possible that it won't be.
Whatever, it's our own fault again, Taggs pissing about instead of just clearing the ball when under pressure and Parry putting in a silly challenge.