by Sowslow » Thu May 03, 2012 5:00 pm
It also does not stack with DI. I believe DI is a % based proc when at 0 health, whereas SG is 100% guaranteed to fire when below 50% health. Even with that DI is probably a better option for most tanks, chanters, etc.
It also blocks you from recasting on the person that fired it for 1 min after it procs so cannot always keep it up on a tank or whatever like DI.