Yeah, Duke was definitely thinking head injury, here.

"Home," he agreed, flicking a glance at the guard (speaking of head injuries) before hurrying them back towards the gift shop. Then he tried a couple phrases in Japanese and Mandarin, trying to see if she might understand one of those languages better.

(Why the hell hadn't he tried that before? The whole 'naked chick swinging in a fish tank' thing must have really thrown him off. . . .)