Disc Priest Spirit Shell being reduced from 15 seconds to 10 seconds

A significant nerf for Disc Priests with Spirit Shell now only active for 10 seconds on a target, down from 15 seconds.  This change is seen to affect 25M raiders more than 10M raiders, because of the differences in how Discs use Spirit Shell under those circumstances.

Pre-5.4, Spirit Shell: For the next 15 sec, your Heal, Flash Heal, Greater
Heal, and Prayer of Healing no longer heal but instead create absorption
shields that last 15 sec.

5.4 PTR: For the next 10 sec, your Heal, Flash Heal, Greater
Heal, and Prayer of Healing no longer heal but instead create absorption
shields that last 15 sec.

Of course, this is PTR, and things could change.