Are you sure it wasn't due to an FAM, federal air marshal?

This happened to me twice last year, on one occassion the marshal sat in my seat and "protected" us while he fed his large belly. Sad for AS to have to give up the seat and inconvenience a passenger. AS will always move a paid F customer into an upgraded MVPG seat and then downgrade the MVPG. Sad for taxpayers to see such a waste.