I think I've dealt with something like that before --- more so with places than characters, but sometimes trying to visualize the movement of my story children gets kind of tricky. Personally, if mapping it out in my head doesn't work, I'll draw a map on my phone or something to see what direction someone is heading in and what direction they're starting at. Typically, this is for more larger spaces though, like multiple sections of a building rather than one room, but if the room is complicated enough, I might have some trouble figuring out where people and things are in relation to whatever's around them.