Something's off with Berserking's internal cooldown. I was fiddling with the short-term-buff facet of my UI and noticed it (Berserk) seemed to proccing more often than Forte's predicted ICD (30 seconds) would permit. After removing one of my (two Berserking-enchanted) weapons for testing purposes and poking at a heroic training dummy for a few minutes, I confirmed the following:
-Berserk was, in some instances, refreshing its buff before expiring (I once watched it refresh 4x before managing to expire)
-The Berserk proc has no functional ICD - even if it expires, it can re-proc immediately, which I did observe (the buff refreshed perhaps one second after expiring)
-There are, however, occasional long stretches of time (10-15 seconds) during which Berserk isn't active and doesn't proc
This was at the Orgrimmar 83 training dummy, wielding a reforged, Berserking-enchanted Shadow's Edge in my main hand and nothing in my off, autoattacking from in front and hitting BT, RB, HS, and the occasional WW to help trigger procs. AP was correctly updating on my character sheet to reflect the Berserk proc. I had a Pyrite Infuser equipped in a trinket slot and, while I wasn't paying as much attention to it as Berserk, Pyrite Infusion appeared to be respecting its ICD.
Has anyone else noticed this, now that I've brought it up can anybody else replicate it, and has this been mentioned or explained anywhere? If so, I can't/haven't found it.
Edit: It's not just me. Here's Berserk uptime from a WoL parse of a guildmate during a HLK25 kill:
Imageshack - berserkuptime.jpg
Edit 2: If Berserk has no ICD, then both Wowhead's comments and ForteXorcist's proc cooldown display are erroneous.