I personally feel that nowadays you will find many types of classes in AC some time elite prefer SL if route is good.
I had a similar experience last month while coming patna last mont some students entered in 3AC in SC PNBE Exp at BUXAR .when some young passenger oposed them and forced them to leave AC coach and locked from inside the same group vacumed train and started stone pelting resulting two window glasses broken but most of AC coach was unaware of this incident.fortunately it was dark at 6.30pm so we escaped unhurt with two smashed windows.