Yamato is more of a ball of nerves than he expected, and his nervousness isn't easing up at all, but he's at least managing to cover it up with a combination of gruffness and military-grade formality.

Barry getting derailed by the science of Milliways is something he didn't account for, at all.

"It's either magic or very high-tech, but the point is that these two have been visiting a kind of interdimensional nexus," he says to Caitlin. "I'm not from this reality. Barry and I met a while ago, and Cisco and I a little after that. Since everyone's sick here, I offered to help out until this epidemic had passed."

He's just not going to mention Barry's whole nearly-passing-out thing. Nobody needs to know that right now.

"I'm sure they both would've told you earlier, but it's a ... strange thing to have to explain," he adds, tone still rather clipped and formal. "It's nice to meet you, though. They both speak very highly of you."

He'd offer a hand to shake, but that's probably a health hazard right now, so he just inclines his head a little instead.