Moira is being driven somewhere... by Diggle! Her regular driver is out sick. Diggle carries an umbrella and helps her out of the car in standard chauffeur fashion. She has him stay by the car when she goes inside. Diggle follows anyway, and it's a bunch of women at a birthday party. He cunningly claims he's looking for the restroom. Smooth!
Laurel and Oliver (as the Hood) meet on the roof. Oliver hands her the doolally that has evidence that Cyrus Vanch is thinking bad thoughts. But then Oliver's finely-tuned senses reveal that they're not alone. And the police jump out! Oliver uses Laurel as a shield, and then jumps to a lower roof. These guys never even get a shot off when Oliver runs away from them. Detective Lance chases him down some stairs, but Oliver gets the drop on him. Pop! Oliver punches Lance in the back of the head.
Later, at the police station, Laurel is furious at her father for having all those cops point guns at her. He, on the other hand, is mad at her for contacting the vigilante. Laurel points out that he deliberately let her take the phone, so he was expecting her to do it. Laurel asks what happens when he catches the Hood: "You're gonna find someone else to blame for mom leaving. For Sarah dying? For your drinking?" He hasn't really been shown to be a drunk. Anyway, he's a policeman hunting a vigilante that's murdered a lot of people. He's killed four so far in this episode! So I don't think it's fair to accuse Lance of being out of control here. Laurel turns to leave and her father asks for the phone back. She slams it on the desk.
In the Arrowlair, Diggle tells Oliver that he doesn't see straight when it comes to Laurel or his mother. And he'll be driving Moira around for a few days. Oliver insists that she's not a suspect. This does not dissuade Diggle. Diggle doesn't really have much to do on this show. He signed on as Oliver's sidekick, but he's only been out in the field once. He mostly just hangs out in the Arrowlair and tells Oliver he's doing things wrong.
Laurel and Tommy. Tommy is annoyed that she met up with the Hood (or "The Hood Guy," as they increasingly commonly call him) when they were supposed to be going out. He whines, "Laurel, he's a murderer!" Not to be out-whined, she snaps back, "You sound like my father." Tommy stomps off.