Where were you last week when the officials invoked "in the grasp" to force 4th-and-26 on a play when he was on both feet AND able to subsequently throw a ball to James Thrash?
The bottom line is that McNabb was flat on his back, legs sticking up, and Favors threw his full body weight on the back of McNabb's left thigh.
If you disagree with the previous paragraph, watch the replay, as it's not my job to educate you.
Similar plays have happened time and time again, and been concluded with much less dramatic "tackles", without injuries, and, even in some of THOSE cases, with yellow flags and/or fines.
The NFL's application of a whole swath of rules is horribly inconsistent, and anyone who things everything was as it should on that play clearly has a horse in this race.
Time for lunch.