I don't think the card was for a high tackle but rather reckless play which it was and IMO deserved a yellow. OF is a talented player but can be reckless in defence and it's one aspect of his game he needs to work on. His tackling isn't exactly Jonny Wilkinson level and he could easily end up injured himself the way he's going.
Have you ever played rugby Murph? Those of us that have view stamping to the head with the disgust such a cowardly and deliberate attempt to injure another player deserves. Your attacks and insults on posters who disagree with your jaundiced view of this incident suggest either you didn't play or were the kind of thug the game is better off without. I'm no fan of Healy as I think he can be a dirty player at times but there was no evidence of a bite in that instance from the video I saw, whereas the evidence against Horwill is so damning I'm gob smacked he has got away with it. All I can say is he better be squeaky clean for the rest of the tests.