I told him no because the box had blood smears all over it
How did you know there were blood smears?
It wasn't easy to see them as they were really small, but I could still see them and they were his blood from where I cut him.
That's scary! It's totally understandable to not want to touch someone else's blood, but cutting him was not right. That's super dangerous for his health.
I know, I was thinking about it for a long time. I was also surprised that someone would stick around after I sliced him with a knife, but he was stupid anyway.
Just because someone else isn't as smart as you, gives you no right to cut them with a blade. You could go to jail for assault and it is very damaging for the other person.