The concept of my story is that i would rewrite the story of the first ever vampire in a medieval setting, and from two perspectives, one from the vampire's friend and brothers in arms, and the other from the vampire itself.
The climax of the story is supposed to be during a confrontation between the two warring kingdoms, where the sheer amount of blood makes the vampire completely mad to the point where he can no longer keep up appearances, where he goes on a rampage, murdering friend and foe alike.
The problem with my idea is that this scene is supposed to be told from the point of view of the friend, who has no idea what is going on. Every time i try to describe the vampire and his actions it feels too "familiar". Basically, how do i describe the cliche "Red eyes, sharp teeth, lust for blood" as if it was completely new and mysterious?
EDIT: The idea is that the description feels foreign even for the reader, who has a vague knowledge of that character's "vampirism".