Write a question from the passage such that it identifies a character (a person or a thing) in the passage.

Example input: I really struggle to feel bad for people who actively choose to be miserable and manipulative. I'm dorky and like to use little proverbs all the time. One of my favorites is this: "you can lead a horse to water, but you can't make him drink." At the end of the day, if someone has a problem, they can never resolve it if they don't truly wish to. You can give someone all the resources in the world, but you can't force them to utilize them. When I was 16, I dated a horrible guy. He was abusive verbally, emotionally, and sexually. He was an incredibly troubled young man and refused to seek help for his severe mental health issues. I eventually came to understand that he reveled in his misery. It was his identity. He acted like he wanted a cure and I'd set him up with resources, but he refused every single one. He may have struggled with serious mental illnesses, but being miserable perversely made him happy and he loved to use his struggles to justify his inexcusable behavior. He wanted to drag as many people into his fiery pit of anguish as possible. I later suffered from severe depression myself, and I never once used it as an excuse to hurt other people. My ex wasn't struggling with his mental health in terms of deliberating and carefully harming others. He was simply exhibiting a personality trait, one he chose to cultivate… and it wasn't my problem. I ended up cutting him off completely in spite of all the threats. I will never feel bad for the awful plight he refuses to help himself out of. I have no patience for that type of person. Know what we call them? Toxic. Poison. A waste of time.
Example output: Who was abusive to the author?
Example explanation: The question is based on the following sentences in the passage - 'When I was 16, I dated a horrible guy. He was abusive verbally, emotionally, and sexually.'. The sentence clearly explains that the author's boyfriend was abusive to her.
Q: I ducked, Cerberus pounced, and Mr. Waciejowski screamed like a dying ferret--a soothing and pleasant sound under most other circumstances, but now only distracting.
I felt the rush of air against my face as the crowbar skimmed my head. The man wielding it was in a black three-piece suit and built like a Texas linebacker. His mass seemed to bend space-time in the parking lot as he barreled down on me. All I could see was nearly seven feet of Armani silk.
I stood upright and brought my knee into his groin and gave him a swift elbow in the small of his back and a fist to the base of his skull. Now, I wasn't the biggest guy in the world, but I certainly wasn't the smallest either. And I was also acutely aware of how much damage I could do to another human being. But this hulking mass in Italian finery didn't even seem phased. The blows I sent this guy should have dropped him like a bag of wet cement, but he just turned and hamstringed me with that damn crowbar.
I fell so hard that one of my teeth chipped. The box flew out of my grip and landed just a few feet away. Out of the corner of my eye I could see Pete on the ground, fumbling with his cell phone while Cerberus mauled another suit trying to sneak up behind me. If the fall hadn't knocked the wind out of me, seeing Cerberus tear into this guy certainly would have.
The dog was all fangs and fur, making sounds like construction machinery. Thick and heavy. The guy was screaming all kinds of nonsense as he kept his shredded arms in front of his face and neck. Blood and fabric flew about as the animal tossed its head in violent arcs.
A:
Who is Cerberus?