Sure, i didnt say the dmg wasn't believable just that it wasnt a regular thing usualy in civil war stalemates or whatever... 600k healing on the other hand...
If they increased merciless zeal back to 2% it might be possible NOW (and would probably make people QQ).. i have done 450k heals as watchman in the current game now cause of the increased hp pools etcetc.. but in 1.1? hell no that was kinda average healing for a HEALER back then.