The pool table shot of Kara made me think of this scene.
I guess, even in Melissa's portrayal, she is showing maturity, wisdom as well as, of course, Strength far beyond her Kara's 'ditzy' undercover disguise, and as Supergirl she also has very mature ethics about the taking of human life between herself, the mere mortals she walks through their life with, and between themselves with their aggressive human psyche. Possibly something she learned from being trapped in her suspended animation cocoon for so long.
And, of course, there is The One-In-A-Million Super pool break that only Kara in her bespectacled disguise could possibly pull-off (or pool-off)