Big no no! Can’t be baiting next to someone.
but depending on someone’s situation they may just do it anyway. Imagine driving an hour to bait up and someone’s in the area but not on the spot, 2hr round trip and no bait, can see why some may just wing it out anyway.
other scenario is, did they even know you were there with it being dark? Seen this happen multiple times in the dead of night, someone creeps round trying to be sneaky and ends up baiting on top of someone in the next swim about 10yards away. Then someone rocks ups 2hrs later and does the same thing, still under the cover of darkness. Club water antics at their finest!