He looks at her. Really, truly looks at her, then lowers his gaze to her hands and tries to work out the gesture. His own fingers link, then, in slow imitation without any actual understanding. This is him offering his support in solidarity.

"Together, yeah, I got it. Keep miming? Ah..." Well, he at least has the idea to switch to the one other language that he knows, which for all purposes is Japanese even if perhaps the name is different to him.

"Do you understand me now?" He pulls at his fingers again, then gives her a thumbs up... that he slowly tilts downward. Yes, no?