Peter caught the knife by the handle, turning it over in his hand as he examined it. He could tell it was fake because of the material, but it looked like a real knife. Trust Tony to make fake knives but make them look real. And even though it was fake, Peter could almost feel the responsibility of holding something that could be so deadly. He brushed it off. He was just doing this because he was eager to learn more and because it would be fun. He was about to swing it, test it out a little, but then Tony was there and Peter looked up. He rolled his eyes. "But lasers don't fit Spiderman. Not that knives do, but you know, lasers are too Iron Man. Lasers are cool, but I don't need lasers to stop a mugging." He looked excited as he turned his attention back to Bucky and Natasha, eager to see them spar.<br/><br/>"You're right I will," Steve said as he moved to stand next to Tony with his hands in his pockets. "If I see blood, training is over." He had been watching them silently up to that point, just keeping an eye on things and making sure Bucky and Peter didn't overdo it. It was just sparring and teaching, there was no need to draw blood. That already happened too often during missions. He was no fool, though. Getting hurt during sparring was something that happened, especially if said sparring involved genetically enhanced humans or super spies that have fought their entire lives. And that was fine, it was part of the experience. Just as long as it was bruises, and not cuts or broken bones or sprained wrists or anything like it.  Especially since it involved a teenager this time. And said teenager's protective mentor slash father figure was watching said spar, and would kill anyone that hurt his kid. Despite it all, he looked relaxed as he watched them. He knew they'd be careful, and he trusted them all to hold back. He knew Bucky and Natasha wouldn't go full Russian spy on him, and he trusted Peter to respect his own boundaries and be careful.