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Due to the fact that you have to get out of the gunfight to regen health, would it not be better to have some of the health to be regenerated upon killing someone? I know the assasins ultimate already has this. However, I think the game would be more fluent in this sense and would give the oportunity to stay longer in gunfights with several oponents.
I dont think a full regen would be right, but some health could be nice.