that's odd, haven't tested it lately, but i remember grounding always eating DG's, i used to laugh over and over again at dk's when they tried to DG my shaman team.

Also BrothelMeister, I'm pretty sure you can cast taunt on players and the caust goes off but then rebounds as "immune". That doesn't mean your unholy strenght can't proc off it but i haven't tested it. a free spell off the gcd every 6 seconds could easily be macro'd in if it works.