Who knows? Any residual snot might smooth over Gordin's perpetual cowlick--

Okay, no. That's too gross to think about, we'll not go into that. But hearing Cu Chulainn laugh is definitely much preferable, and focussing on that helps land the finishing blow on his tears.
"Done. I might take a little while since I'm so old and we'll probably have to take a few breaks, but I reckon a few laps of a city so big should have everyone going home in no time. Imagine telling your brother that!"

It's just what he's doing, after all. Getting to brag to a captive audience about saving a strange, futuristic city...Aw yes.