The first time I watched, when Teyla kicked Michael off the tower I kinda did a double take. Then I thought about it, and realized that if Michael had rolled off, or if his hand had slipped, or if Sheppard had "accidentally" thrown him off while they were fighting, I'd have felt cheated. I swear someone just commented somewhere about the number of times villains are conveniently killed with no-one's hands bloodied by it...