Cool....
So Logan can regen even from blood but if you stayed in the area Leech killed him you would see Logan slowly reform somewhere nearby!
Burn the ground destroy all traces.
It was crystal that did it and it was not in any ways pis. It amp his power however it did not transform his ability, meaning theretically he has the ability just not the power out put. However he has since then healing from a skeleton on several occassions and sabre-tooth has healed from pieces of flesh the size of ones finger before.