Help me figure out my damage

[poondavo]

https://worldofwarcraft.blizzard.com/en-us/character/us/khaz-modan/carry/

My 11 Warrior does just fine in dungeons but sometime I am hitting a boss for 1600 crit with my Bloodthirst. Normally I might hit for 400 crit for my Bloodthirst. Any idea what could be activating?

 

[Hashbrowns]

I also have some massive Bloodthrist sometimes as a 20.

My guess is trinket proc, Crusader, and a high damage roll from your wep swing. Or scaling is just bonked.