Earthshield and effective health
Not sure if this is still true, but back when I was a shaman healer, earthshield would prevent you from dying, which means it would funchtion kinda like block when computing effective health, however because it can only have the possibility of ticking every 3 seconds, it may not happen during a burst. However, if over the course of the healer "reaction time" for your EH you are getting bursted a lot, it's not likely that you took damage just before the burst (delay in autto attack, etc) would the healing from an earthshield count towards your effective health in general, or would you discount that from the burst scenario entirely, much the same way you would a HoT, which cannot save you from death.