you have your pvp gear on as far as I can see.
OTing gruul is an unpleasant job for a warrior because rage is hard to come by and that leads to low TPS --> raid dps needs to chiil --> you will get more growths --> you need metric fucktons of armor and health to survive.
Druids are ideal OTs on gruul since they can rely on doing damage as a rage income instead of taking damage..they also have very good mitigation to this kind of damage..
Basically you need to have around 17+k HP and 14+k armor to even stand a slight chance against gruuls punches when hes 13+ growths...
I dont make threats...I make promises~!