I don't know if is a bug but i don't think about it. I only know that i was in full HP, then "Vella" used poisons and Rapid Shot. He hits me with that damage...17822 x 2 + Sustain Shot = bishot.
And i think that 18k damage with a normal skill is unusual...maybe he could do it with Pantera Vision or Apocalyptic Shot, but not with Rapid Shot. It's like if i hit 18k damage with Magic Arrow...in 20 seconds ADM/GM will ban me