I explained about perforators, I conducted research on this subject: in fact, it is usually not the same neighbor. When I went to look for this deck, it turned out that this particular repair is done on three floors up and down and not even always need / under me. It seems to us that you are being knocked directly into your wall because you do not directly hear the sound of the perforator, you hear the sound that your vibrant walls do, although the source of the sound may be far away and in different places. And in a multi-apartment house somebody is somewhere, and we write to our specific neighbor.