The kind of tackle where, despite all efforts aimed towards consistency, I can well imagine a room full of referees (or a forum full!) arguing vociferously for everything for no foul right through to red card. For me it's a foul and a yellow card .. he clearly shows complete disregard for the safety of the opponent. However I could understand Red (Excessive Force), or just a foul (No real harm done). Not giving AT LEAST a foul would (IMO) send out the wrong message to all involved.