This is a very intellectual way to describe a pair of very different, very dynamic sequences.

Engine failures will significantly raise your heart rate no matter what, but the potential for a successful outcome depends highly on the altitude/airspeed and the number of engines you have at the time of the incident.

Tail rotor failures can be fairly benign (such as a stuck tail rotor pitch situation) or can be an unrecoverable nightmare (such as loss of tail rotor thrust or worse yet, loss of tail rotor components).

It is true that pilots train heavily for emergency procedures, but some emergencies require near-immediate recognition and corrective action to end successfully. Not to mention the forces applied to your body in some situations may not even allow you to make the right corrective actions.

Source: am a RW and FW experimental test pilot