Ifresh, in theory you may well be able to autorotate with a tail rotor failure if the aircraft gets it at a convenient time. "Convenient" would normally mean at an altitude which gives you time to think, at cruise speed to help maintain directional control, in a lightweight aircraft, using low power, over a nice big soft field.
I regularly teach this malfunction in the simulator in a benign environment, and even then most people will crash the first couple of times.
A heavy aircraft full of troops at low altitude over a built up area with people shooting at you is the worst environment I can imagine to get a tail rotor failure. Barring a miracle, it is always going to end in a world of hurt. When you are hovering at heavy weights, the engines are producing a huge amount of torque. If the tail rotor departs, there is no anti-torque reaction and you will start to spin rapidly. Its inconceivable that you could turn the engines off and lower the collective quickly enough to maintain control. Even if you can, its only going to help if you are over a nice big flat level area with no bad guys in it.