As much as Shin would've liked to ignore the loud commotion at the other end of the courtyard, his curiosity got the better of him and he just had to see what was going on. Of course, he had seen the student jump from the roof and land with a thud. The student had to be alright because there weren't many that were stupid enough to leap off a roof without knowing they would make it unless they were thick in the head. Either way, it would be good to make sure they were alright. 

He arrived at the group later than the others and was just in time to see a large student fix the hole he had made where he landed. Before Kawaguchi knew it students were challenging each other to duels which wasn't that unusual but under the circumstances it was a little strange. What made it all the better was it looked like the underclassmen were getting cocky and trying to challenge Ban of all people. That was when he noticed the cheap shot that one of the other students tried on the larger student.

As quick as the student was with his mop, Shin was faster as he grabbed his sword off his back and deflected the direction of the mop. The sword echoed from the contact and started to hum with a low resonance that if allowed to continue would start to cause a headache to those hearing it. "It's not nice to try and strike someone where they aren't prepared. At least show some honor when issuing a challenge." He told the younger student as he kept the sword in his hand but placed his other hand flat across the blade to settle the reverberating. 

"Sorry for butting in Ban. I know you can handle yourself but not fair to be struck when your not prepared." He than took a step back as the challenge was thrown out which a smirk on his face as he knew this would be entertaining.