What a frivolous incident for both parties. Pilot should've known better than to make physical contact with her. Verbalizing his dissatisfaction with her adjustment would have sufficed. Especially with an insecure and power hungry TSA agent. I know, I know, one can only endure so much idiocy from them, but restraint is necessary.
This all began with the pilot's reticence towards her query, it would seem. She didn't care for it and felt offended and took it a step further. I'd place the blame on both agent and pilot. No reason for this to have escalated. Shaniqua should know better. She had her feelings hurt just as the pilot did from her adjustment. Truth is, everyone has their dislikes of other individuals (for whatever reason, whether it be race, title, looks, etc.). Clearly, these two disliked eachother enough to grab an arm and to make a mountain out of a mole hill by detaining the pilot over a questionable action of his. How hard he "grabbed" her hand or perhaps he merely blocked or prevented her from making too many hand movements with his tray. It would appear he was able to continue on without any problem. Agent goes and cries assault. Incredible.
The sad thing is, the TSA agent will end up being the victim. The sentiment will be lost. TSA power is scary. It's like nukes in the hands of a third world country.