My room mates cat snapped for no reason and latched onto my leg and started biting me really hard.…

My room mates cat snapped for no reason and latched onto my leg and started biting me really hard. He was growling and snarling. I had to literally beat him off me cuz he wouldn’t let go. I literally wasn’t even looking at him when he did it. At first he bit my foot so I pushed him away and then he went nuts. If he’s gonna do that to me I don’t wanna know what he’s gonna do to my cats. 10 marks in all on my leg