The Flash, Season 3

Julian:
I thought you'd like to be informed that H.R.'s managed to talk Tracy around.

Cisco:
Ah. Perfect. That means we can get to work.

Julian:
Yeah. There's one thing I need to know first. Outside Jitters earlier, you could have stopped Caitlin with a vibe. But just like CCU... you didn't.

Cisco:
I'm not doing this again... [tries to leave, but Julian stops him]

Julian:
No no no no no. You are. I need to know, Cisco. Tell me why you couldn't do it.

Cisco:
[hard] Get out of my way. [goes around Julian]

Julian:
Caitlin could be home now. Had you stopped her, she would be here. But you didn't. You couldn't. Tell me why!

Cisco:
Because I'm afraid!

Julian:
Afraid of what?

Cisco:
Afraid of killing her! [indicating his hands] I'm walking around with two loaded guns here, ready to go off. And what if she's hurting Barry, or Joe, or you? And I have to save you and I can't control my powers and I end up killing her? She's my best friend. And I'd rather it be me than her.