As we strolled down the city’s sidewalks, Xipoogi walked behind me, with Xaboasi behind him. I slowed down to let them catch up. They slowed down too. I slowed down more. Ditto. I stopped. They stopped. They simply would not walk beside me, not even when I asked them to. This makes sense on a narrow jungle path. [. . .] In the city, though, walking abreast, while spatially inefficient, allows the walkers to converse more easily and to be perceived as a group. I smiled about our walking arrangement.
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McIlvenny et al. (2014) studied this question.
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