It was the leap and follow-through that made it reckless. He can't control what he's doing, which is why he snapped Shaw's leg in two.
Graham Poll claims it was a red and a penalty in his column, which just shows that the officials don't really know what they're doing.
When you've got access to repeated replays from multiple angles and senior refs can't even come close to agreeing on what should happen, then there's a clear issue.
People will make mistakes during games, but when they're given an incident in the cold light of day, then they should be able to come to the same conclusion.
That one says red and penalty and the other says no foul at all is a bit ridiculous.