In response to the question about identifying her guard, Irene emphasizes to not let anyone know she sent them. Ever. However, her personal guard can all be found by a small tattoo they have on their necks - a basket-hilt sword with a rose growing around the grip. They're kept low enough where they can be hidden by shirt collars, so it'll be difficult for him to identify them unless Wash somehow gets up close. At the same time, it is the best and most likely only way he'll be able to find them.

As for the two-way offer, Irene just smiles in a way that comes off both friendly and insulting. If he wants more targets, Wash can talk to the royal guard captain. She's left it up to them in the hopes it'll instill better morale amongst them. It's... a work in progress. For herself, she only cares about results. Get her some information about her guard - even if it's just proof they're dead - and then he can come back here and start proposing deals.

Now take your sidequest and shoo. She's got a line of people who want to waltz in here and bemoan her inability to lower taxes on the wealthy. It's so hard for them, you know~. Entitled prats.