Felicity and Diggle in “Unfinished Business”

Felicity

I should have taken him to a hospital.

Diggle

No, Felicity. That's why he asked you to bring him here. Because if you do, the police will want to know how and why he got that wound.

Felicity

I'm guessing "How?" and "Why?" are Oliver Queen's least favorite questions.

Diggle

Yeah, well, there's also "When?" and "Where?" he's not too fond of.