When Hiccup got captured, Whip-Slash threatened him. Later, Hiccup gave him a fish but the dragon spited it. Then, Hiccup pulled a hook out of his mouth and gave him the fish again. This time the dragon ate the fish.
Later, Whip-Slash and Steeltrap tried to melt the menacle tight from the fighter Razorwhip tail but failed.
Whip-Slash is a yellow-green Monstrous Nightmare with red eyes. His body it's covered in scars.
Whip-Slash is the only Monstrous Nightmare with red eyes.