Well what was stated earlier in the topic was tl;dr friend is bloodthirsty, though in addition I asked him to describe it to me since he's curious as to peoples' thoughts (he's a FB friend.)
"It feels like pure violence coursing through my veins, inhabiting my mind, and every nerve in my body. Sometimes I double over in pain... I want it to stop, yet at the same time I did not. It feels euphoric, exhilarating, yet at the same time... frightening. As if it's a second mind invading my own, yet at the same time feels like my own mind; the energy is chaotic and very strong."
*shrug*