Arrowverse VS Justice League

The Flash (CW Flash's POV)

    This is going to be the same as the Killer Frost story up until now, so I'll just skip to the part were Cisco and I chase Siren X.

    I was running at full speed. Where was she? "Iris!" "I'm looking." She said. "She's headed towards Star City!" "I'm on my way." I said. "Hey! Don't forget about me!" Cisco complained. "OK. I think I beat her here. Not bad considering I got an F in gym." 

    I kept running. In the corner of my eye, I saw blue lightning. Another speedster high on Velocity 9, a speed drug. "Cisco! Can you catch Siren X by yourself? It looks like someone got ahold of V-9." I said. "Are you sure you can handle it? V-9 is really strong." Cisco replied. "Don't worry. I've got this." I said, changing direction and heading straight at the lightning.