[Not getting weird looks does help. He can tackle his crises of confidence one at a time.

Instead he focuses on the question, because yes, "beat the shit out of them" is not an option. The guards are just doing their job, after all!]

Well, we could just act like we're dumb lost kids and see if they let us go nicely.

[He means that as a joke, because he knows that any guard would look at him and Donnie in their ninja gear and assume they're a threat. At least any guard worth the pay would.]

Otherwise we may just have to... knock them out?

[He's unsure. He's never had to deal with normal non-mutated human guards, Foot Clan soldiers aside.]