Jin recognized that murderous glare immediately, a glare many of the Knightmares in his world gave him before trying to kill him, combined with that fake laugh and excuse any doubt that he wasn't a cosplayer had been erased from his mind. He had the belt at his disposal and he could probably transform and neutralize him, but the fact that the sorcerer girl still had the grenade with her meant that she could cause damage to herself and others if she were to pull the pin in panic, like if she saw a man in white armor beating an “innocent cosplayer”. Thankfully the high schooler managed to convince her to give the grenade to him, perhaps he wasn't as normal as he looked, but for the moment the fact that he helped Jin remained the only thing that mattered. That thing didn't resemble a normal grenade and with the explanation of the girl it made a bit of sense why that fool was laughing like a maniac when she was about to pull the pin.

“Sick Bastard”  Jin mumbled to himself as he prepared to transform, pulling his Excalibur from his bag. It seemed like the kid beside him was already preparing to give the soldier a piece of his mind. “Like the kid said, it's better if you ladies go first since I still have to prepare my costume, since you can't cosplay a Masked Hunter character without a costume” He couldn't afford to let that psycho run around free for even one more minute, especially on a place as crowded as a cosplay event. Pressing a button on his belt Jin was surrounded by a quick flash of light before reappearing in the White Hunter armor “Dunno who or what you are, but I come to deliver judgement unto you!” Jin said before pointing his sword at Kyoran. The belt hadn't recognized him as a Knightmare, so either he was a new monster or just a madman who found a very dangerous weapon, either way Jin had to be on guard.