My parents have had an air-frying capable oven of decades. They also paid a lot, lot more than what the typical air-fryer costs for it.
Cheap convection ovens do a poor job at moving the heat around, the “pulsated” heat function is mostly a marketing gimmick. Great convection ovens are doing a much better job but they are also five times the price.
I’m going to go even further than you and say the director of the prison should face severe consequences (as in, years in jail) for failing to protect a convict.
Prisoners have most of their rights stripped away from them as a punishment. Defending themselves or avoiding situations where violence can happen is not possible for them, and the responsibility for that therefore falls on the people in charge of applying the punishment. Here, the management of the correctional facility.