So it is been some time i have wanted to ask this, this happens to me somtimes I had stamina or magica depending on the toon and before dying i click the heal and there is sudently no magicka or stamina i am at 0 and I die, well i have to say that I have not been watching the bar because my attention was on the fight but i have good recovery and almost never end up without stamina, the fight has to be very very long to end up without stamina so I do not know if it is some sort of drain people uses of which i am unaware of or my guess is that I am clicking but I am already dead on the server because it usually happens when I had very low health but not on my computer and that is why the heal does not activate.