User blog comment:Mckrongs/Monster Hunter Frontier Season 10/@comment-3298463-20110223142547/@comment-3298463-20110223150646

They just deal a little damage.

The wind he does with the tail now hurts too.

Though it isn't shown in that video, if he catches you with the tongue you don't get temporary invincibility like when you get hit, but keep taking damage. Then you fly into his poison cloud and basically you die.