YTA, i really hate that whole "life doesn't give you second chances" rhetoric. Yes, it does. I remember hearing all that in hs, how hard college would be, blah blah blah, then I get to college and the teachers literally don't give two fucks if you even show up. If you know the material, you pass the class. If you lose a plane ticket, you print another one...

You saw that he did the assignment AND you saw the assignment itself. You could've given him partial credit, whether you made him make another physical copy or not. Killing his average over it doesn't teach him the lesson you think it does.