Arashi was met with Motima spinning on a heel, giving him some pose of bravado and confidence, even if a bit dorky. Arashi's lips at on corner raised into a smirk, him trying to hold back a laugh--not wanting to be rude or rain on the guy's parade. He noticed that the teen was younger then himself, probably a little less experienced, but at the same time he refused to underestimate anyone due to their age. Just the other day he was in a room with a woman around three years younger then himself--who could've ended him before he realized what was going on.
He'd listen to Mort, explaining he was indeed who put up the flyers, before lowering his pose and likely giving the Inazuma clan head a more normal expression, cheery at that. Finally, someone else who could keep up with Arashi's cheeriness, only making the blue haired man smile more. Although this didn't stop him from noticing the shift in the young adolescent's eyes, a flip from green to gold, Arashi blinking in slight confusion as Mort had turned to walk towards his arena.
"Ah...om" he would emote in confusion but Mort basically spoke over it, easily missed. He'd express that they could chat in battle, which drew a light chuckle from Arashi. "Mort huh? I'm Arashi Hayate--Head of the Inazuma clan." he'd reply to the introduction, going ahead and following Mort into the arena. "Mort...Mort....how about Morty? Yeah. There we go, its nice to meet you Morty!" he said with a cheery tone and a toothy grin...the nickname probably making Mort wish he hadn't given the man any permission for a nickname.
"Well...if you're keen to start this, what are our guidelines...sword only...hand to hand....all out battle to the death? Haha only kidding on that last one man." he said with a snicker. Clearly Arashi wasn't one to let much get to him, much happier and easy to make jokes then most overly stoic shinobi. Still, he dripped with confidence, and a sense of honor--all written in how he stood, carried himself, spoke. A rare breed.