Is it normal death threats

Live in group home, my flatmate lives in supported living part. I do not. When he sees me, he says the nastiest things ever. He has at least 100 girlfriends beating a path to his door (he says this but I've never seen any) I have anxiety.

He has threatened to end my life more than once, in increasingly gory/violent ways. Pouring meths down my throat, setting me alight etc.
My legs always feel weak & tingly when he says things like that & I'm glad I'm wheelchair-bound as if I wasn't I'd fall over. I wriggled about in my seat & he said I make a face like a porn star. I stiffened up, threw my head back & screeched –- I can talk fine but I have to repeat certain words, therefore don't need to scream. My heart was pounding down my legs, I felt great. He said it was an orgasm but I've never had sex as I can hardly move.

I've cried afterwards, begging him to make his threats nastier, which he does. When he does the anxiety goes away & the thing described above happens.