What that meant is that the only people who would bump into each other are those who are actually on that floor and who are bumping into each other anyway.
این بدان معناست که تنها کسانی یکدیگر را ملاقات می کنند که دقیقاً درآن طبقه هستند همان کسانی که به هر حال با هم برخورد می‌کردند.