Oh, I was a bit confused on why did grandpa's rank goes down, but turns out I mistook Snape's rank for his.
Also, a bit of an unrelated tangent, but despite this and many mangas showing this glory-seeking behavior as something bad, back when I was still in school, a lot of students (me included) seem to lack initiative to do things outside of going home and playing. It doesn't sound bad, but when some people aren't brave enough to ask permission to go to the bathroom, it's definitely not good.