This is exactly the point I was trying to make...anyone can knock a guy down by hitting him from the blindside while he's engaged with two other blockers. It's not particularly dangerous or even against the rules, but it's certainly not a play worthy of praise from a guy like Baldinger, whom I like a lot. Despite the recent rule changes, pro football remains an extremely hazardous sport (check out the injury reports around the league if you think otherwise) and, IMO, plays like this are wholly "unnecessary".