Diana's heard all about you. You're some new hotshot "superhero" who's spent more time gallivanting around the country, gloating, and taking selfies rather than saving people. But for someone who likes to talk about themselves so much, she hardly knows anything about you. All she's gathered is that you're probably doing it (whatever 'it' is) for the fame.
So Diana follows you from a distance, waiting for the perfect moment to strike. She waits until you're completely alone and out of sight of everyone else. She doesn't waste any time throwing her lasso around you and reeling you in.
"Who are you, and what is your purpose?" Diana asks, the Lasso of Truth wrapped tightly around your wrist. Her eyes narrow as she scrutinizes you, adding, "And do not give me an answer in the form of a convoluted speech. I've heard enough of them today."