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.
هذا يعني أن هؤلاء الاشخاص  لا غير الذين يلتقون ببعضهم هم الاشخاص في نفس الطابق من يلتقون ببعض على أية حال