Between mobs? I've heard that argument before, but how many seconds is that? Not that many. It costs to cast and it takes too long to break even, let alone gain some. The theory would be there yes, but in practice the time between mobs is just too short.
Standing in the starting area after a prior run is the place where you can use it, or in solo runs where you can take the time to regain mana by standing still sufficiently long. Outside of those two (insignificant) circumstance your skill points are better spent anywhere else (besides protection naturally).
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