"Your world is pretty damn weird," Yamato remarks to Caitlin, flashing a grin at her. "I mean, even before metahumans showed up, there were still superheroes like the Arrow, right? My world doesn't have any superheroes."

There isn't even one bow-wielding vigilante in Yamato's world. They have a marked lack of bow vigilantes.

As they enter the lab and Yamato hears Cisco's theory, he squints for a moment, before his gaze flicks over to Barry, then Caitlin, then back to Cisco.

"Okay, that's not ... impossible, kid," he allows, "but I don't know if it's likely."