More examples of how it is supposed to work:
Enchanter uses pet to damage a mob near death, then memblurs it to kill it for full exp. But the bug here was the health jumped 25-35%. Good discussion on memblur and regen, nothing like what is happening on P99.
here.
Examples of memblur and speedy regen, but not instant full health
here
and here
and here
and here
and here
and here
and here
here, used on boss mobs
and here
and here, used to grief raids, but not like on P99