Are you quite sure of that? Cause my hp has a way of draining half way out during one of my long sliders. I was expecting it to stay about the same throughout the slider, not try to kill you while you relax.
10, the idea came to mind when making my Ai - Believe map. If you remember, the insane difficulty was infamous for having a ridiculously high hp drain rate. But at the long slider in the game, the hp drain rate slowed down to make it more fair.