Hiroshi instinctively stood up, his wand already wrapped tightly around his hand. Hiroshi had no idea what he was doing, this was incredibly out of character for him. This wasn't his fight, he barely knew these people. This could get him in serious trouble. Trouble he could avoid if he were just to sit back down. He couldn't afford to make any mistakes and get sent back to Japan. It took nearly the whole year to convince his dad to let him go to Hogwarts. Hiroshi just couldn't afford it. He placed his wand back into his pocket, and right as he was about to take his seat again, he looked up at Cal. 

Cal took a look at the boys in the compartment with an expression that clearly said he needed help. Hiroshi tried to look away, but something inside his head kept creeping and shouting for him to stand up and help. Hiroshi felt his palms get sweaty, he tried to reason with the voice inside his head, but finally something snapped. His hand reached for his wand again, holding it behind his back. He looked at Cal and gave him a nod of approval.