Post 10/10 Pages with swords/ Knives/ Blades/ even box cutter will do.
Because people post pages which they enjoyed when reading the manga.
Do you really think people think about how good a panel can be out of context?
The prime example is the crying man from Sumire at OPT.
Won-sul went from being a dickhead to be incredibly cool.
I GUESS YOU CAN CALL IT A CUTTER OF SOME SORT.