And Sara had just left.

"Oh, Oliver."

Caitlin steps forward and puts her arms around his shoulders, hugging him tightly. That means that he would have been from the same time they were dealing with Zoom.

"I'm sorry," she whispers, "I wanted to talk but I just...got so afraid every time because I didn't want to hurt you or hurt Felicity. I thought you'd...be better off without me."