He doesn't see it now, how could he possibly, but a lot of the things he'll do going forward can probably be traced to this moment. Her belief in him, this hug for her. Him half-heartedly attempting to 'help' the Barry Allen from Earth 2, going to 'Camelot' for Caitlin, actually going to a diner with his temporal original. Anything else. Barry Allen had Joe West, and apparently Savitar has Kara Danvers.

The laugh gets a snort from him, a sort of vague semblance of a laugh. "I think I've had way too much to drink."

Ha. No kidding.