Cannot Solo [Lupello] in Valley of the Four Winds, Pandaria

THIS is a mob balancing request.

I am stuck on the quest Lupello, in the valley of the four winds in Pandaria expac. it s a tough boss mob that 9k for health scaled at lv 42
and I keep die-ing as its doing often 1k+ of damage per hit then a fear ability that interrupts my ability to fight back…
help? no other players are in that/this area… so I cannot win and continue to play at this rate… please either nerf its damage or health or can you please mark it as complete so I can move on? I really don’t like asking for that but. I logged out of the game for now.

so yeah I am not the only one having issues.

edit:

I was for some reason able to beat him on the fourth try…
it seems the buff something dragon slayer buff was active I got while in Stormwind last…
so crit and main stat buff.

so that and some advice from a friend… how better to rogue.