The Rows and Column Problem

We have a problem in via the problem posing page at aproblesquared.com from Rowan who says, when there is somebody behind you when you open the door, a specific door. Rowan doesn't specify what the door is, but they then want to know what is the polite distance to wait for someone and what is the creepy distance to waiting for someone to back. I mean, we've all had this problem. So if anyone can come up with something that you can add and reverse, let me know. And I'll implement it at the rows and column. You'd cluck in your order.