I've just tried it, the perk is working as intended now, you don't get super for a hit, but you get bonus super for a kill, the perls do not double stack either. Thank god for the fix.
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No, now if you kill 5 enemies with a grenade you only get extra super for 1 kill.
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Because the first kill procs the extra super energy and the other 4 become subject to the 10 sec cool down immediately. Multikills no longer work with grenades for ashes to asset since only one kill triggers the perk and subsequently the timer.