It looks like The Flash is giving Kid Flash some tips on how to fight crime. First rule of crime fighting: always be super serious (he learned that from Oliver).
Wally: Man, that was so dope. How do you stay so calm? You're like scary calm in the middle of a fire. Barry: It's just experience, Wally. That's why it's important for you to shadow me for a while and try to learn everything I know. Wally: And then I get to kick some ass.