military helos with no tail rotor

if a military helicopter, say a small gunship armed with a couple of rocket pods and guns has a no tail rotor system like on the late model Hughes choppers, does this give more versatility and speed compared to a normal helo? my main question is that what happens if the engine(s) fail and the helicopter should auto rotate like a normal tail rotor helo before it crashes? if the engine gases are ducted to the tail to control left and right movement instead of the tail rotor, if the engine(s) stops, doesnt the control to move left and right? so the helicopter would drop like a brick? or spin round to earth. what are pilots taught to do if in such a situation if the power fails and they have to land right away in a no tail rotor helo? i think they dont have the versatility of a tail rotor to auto rotate so does that mean a crash? over to you… :confused: