As test pilot on Mi24 and training captain in both Mi24 and Mi26 I can tell you that we practice t/r failure procedure on both types. Yes Mi24 very powerful helicopter and possibility for yaw is there but rapid detection of problem and immediate response is make in flight recovering possible.
For information there has been quite number of Mi24 which have landed without crashing after t/r problem.
My friend Vladimir work in US in late 1970 and say Hiller 1100 have no power.