The Magahee injury was incidental contact. They both went down.
Heinz Ward broke the Cincy Bengals jaw on a semi-blind side block. He regularly jacks guys up on those plays.
The guy who hit McGahee smashed Wes Welker when we was pretty much defenseless. And, he went in high. There was an intention to blow the player up.
The also took Carson Palmer out for a year with a knee hit.
Maybe no flags on all of them but any team that plays the Steelers knows that they like to hit hard and do it borderline.