I love SoC in PVP, its so much fun. Cast it on nearby critters then just wait for fireworks!
Myself and a Paladin friend got all kinds of free kills while farming the Demon Hunters on top of BT when people would swoop in and try to gank us. Funniest one was the Rogue who shadowstep'd in about 1 second before 4 SoC's went off, then did it again 2 minutes later.