When we prostrate a goshti while someone is standing, either they should move aside on their own or we have to go past the person standing to prostrate. If these are not possible, we can just simply prostrate the gathering as it is not considered inappropriate.
Sometimes the person standing could be servitors proceeding towards a kainkaryam. One need not be extremely mindful of such things and can simply prostrate. The objective must be to prostrate the goshti.