It says "Jolt silences all enemies within a 2/4 yard radius around the target."
I maxed this talent before CC update, wasn't satisfied much because after I tested it, the creatures around the target didn't aggro to me, but some creatures around me did aggro to me instead. Is it bugged? Or anyone knows how does it actually work? I don't want to spend any more EP only for testing 1 talent :/