Actors don't listen to each other. You're so obsessed with what you're saying or doing that the other person could be talking in Swahili and you wouldn't know.
The tune was too ingrained for Mortenson to consider the novelty of this moment- an American, lost in Pakistan, singing a German hymn in Swahili.
I could speak to you and say, 'Laytay-chai, paisey, paisey. '. . . Why aren't you responding? Oh, you don't speak Swahili. Well, I've got news for you. The dog doesn't speak English, or American, or Spanish, or French.