You can't cast it on other people^^
The old Design of that Talent activated SotS once you casted PW:S on yourself, making you immun to silence and such. It has now be altered into activating Inner Focus, forming said CD into an Oh shit Button of sorts in PvP. In short, the "oneself" part only referred to the old design of using a spell you could cast on others onto yourself.
Also it becomes longer, but you don't have a shield up instantly. However its also usable when you have the Weakened Soul debuff so I really don't know wether it's a fix, buff, or nerf:P