Using High Albedo and Friction Fire with unrelenting, I got multikills on redbars and majors, killed bosses and ultras, but nothing is triggering the health regeneration.
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It does nothing. I've reported this before but Bungie absolutely refuses to acknowledge more bugs. Just wait til they go on vacation for 6 weeks (as if they haven't been on vacation for the past 6 months) - you'll hardly notice it here.