Low rpm also brings less stability, so a little cyclic stick movement can lead to a lot of response...
you will probably have slower response to cyclic input but the aerodynamic damping will also be less - the apparent lack of response can lead to larger control inputs and over-controlling.
As with TC - my theory about it happening on approach or departure also went South.
I'm not sure there is any confusion about dead-man's curve - inside it you are unlikely to be able to achieve a safe autorotative state that will allow you to carry out a normal EOL - it assumes a one second delay between engine failure and pilot action. It doesn't mean you will die but unless you are very skillful or very lucky, you are probably going to bend the machine and possibly yourself.