The expression, a chip off the old block means that people who resemble their parents in some way. For example, you could say <span>“Mark just won the same sailboat race his father won twenty years ago; he's a </span>chip off the old block<span>.”</span>
The monster threatens to hurt Victor's family if he doesn't help him.
Approach an adult such as a high school counselor. Inform them of the situation. Then, after the adult consults with the friend, I would approach him/her and help them out with whatever they are going through. I'd tell them that I'm there for them and try to help to get them to stop.
