The researchers were out in the parking lot, and they were counting people as they came in and out of the store, and they noticed that when the volunteers stood in front of both doors, people stopped coming out of the store at all.
Les chercheurs étaient sur le parking et comptaient les gens entrant et sortant du magasin. Ils ont remarqué que quand les bénévoles étaient devant les deux portes, les gens ne sortaient plus du magasin.