I haven't seen the game but...if a player's cleats hit another man in the chest, it's a dangerous play and probably a red.
Intent has nothing to do with it. Has there ever been a footballer in history that has intended to make contact in the box and commit a penalty? No. But if the contact happens and the player is brought down, a penalty is given.
I'm not sure where you're getting the whole intent angle from. I'll look at the replay tonight, and see if it was a bad call. But intent does't apply.