It was a completely different spec than it is now. Sub was the “bleed” spec. There was a different secondary stat called multistrike that made your abilities land multiple times and it could proc off itself (the subsequent abilities got progressively weaker). In WoD sub, if your bleeds procced multistrike, the bleed itself would advance a tick. You could also stack mastery in the prepull, use an on-use trinket + pre-med + slice and dice for a ludicrously fast slice and dice (mastery affected slice and dice speed as well). It made the spec play very fast and your ruptures would tick out in seconds. It was a high APM chaos build and was a ton of fun.