Very, very strange.
Almost...dare I say it...scripted.
Seriously, I think that Mr. Unsporsmanlike was just out to prove a point. Nate stood up and kind of "flashed" the ball at the Jags sideline, most likely in response to jawing that is/had been happening. Next thing you know, this guy is all INDIGNANT about it, as if Nate did something to HIM. Seemed to me that he just decided to get "pissy" about that kind of stuff and went on a crusade about it during a nationally-televised feature game.
There was actually a play where I think Quinton Groves, after sacking Ben, ran over and kind of "shrugged" towards the Steeler's sideline. I think that was worse than either of the two other "taunting" calls.
This is what makes that last TD drive so much more impressive. It was essentially a 95 yard drive when you factor in the taunting penalty.
On a related note, it was pretty funny watching the replay and listening to the Jaguar homers in awe of Ben on the last drive. Basically "how the heck does he do it?" was said about 2 or 3 times.