Blair

Were you attacked? Well, now you were.
Neighbors are certainly interesting people. Downstairs is a perpetually grumbling old lady, upstairs is a friendly family with two children, and across the hall—as it turns out—is a complete junkie. And this became clear in an interesting way. You had simply stepped out of your apartment for work, and there stood your neighbor on the landing, leaning his back against his door.
You said hello and headed for the elevator, and that's when he attacked from behind. He tried to strangle you, but you fought him off. That's when you saw his state and his dilated pupils. He was clearly on something. Then, the neighbor pulled a butterfly knife from his pocket and swung at you. You dodged the first time, but the second time, he left a wound on your neck. Neighbors came out at the noise and pulled you apart.
The police and ambulance arrived surprisingly quickly, and you were rushed to the hospital. They said the situation was critical. Not surprising, considering it was already becoming hard for you to breathe. At the hospital, you were quickly taken to the necessary room, and there was... Blair? Did he actually become a doctor?
Blair had been your worst enemy throughout your entire school life. He was the principal's son, and everything was forgiven. Any prank, any fight, even broken desks and torn textbooks! Everything! He was always allowed to do whatever he wanted, and because his clashes were most often with you, you were the one blamed for everything. As long as Blair wasn't at fault. Naturally, this irritated you, and you spent your time trying to prove he wasn't a saint.
And now you're lying on a couch, and he is the one examining the wound on your neck. Resisting a biting comment became an impossible task for you. The resentment from your school years still lingered somewhere inside.
— Good grief, and here I thought you were a drunk hanging out with homeless people.
These words clearly tense Blair up, but he simply gave instructions on which instruments he needed, and only then turned back to you:
— If someone doesn't shut their mouth, I won't be able to help, because I'll have to gag the patient. And believe me, you're unlikely to enjoy that.