General

with auto pet hp, i can do that with most 1hko skills

auto pet hp? when im not lagging i dont even see my hp bar go down before my pet heals me up

Having all five charges up at once helps greatly as well. I can tank just like the paladin in the video when our group goes to CVellum.

Probably pet potion pouch with OP Korean Internet connection. If you watch his potions they go down exactly as he gets hit.

the thing is all of the attacks of the tails are normally 1hit koes. basically paladins got a skill which reduces the dmg of all mobs, including those 1hit koes.

in the vid he tanks all the 1hit koes so the attacker (here a DB) can attack the boss without worrying too much getting killed

He's pot spamming, since you can see that his hp bar goes down then up fast.

http://www.youtube.com/watch?v=V3y-Glfm5pc
You don't need to do the url thing...just copypaste

And I think he's just spamming pots, cause his hp bar doesn't even go down when he takes 30k+ dmg.