What Ross said. For me a big part of the windows exercise is distance estimation, since that is something I'm terrible at. There is also the added benefit that you want an attackpoint for when you exit the blank spot, so your head is up looking for that, a behavior we want to encourage!
I'm sure we will do this again at our
Pawtuckaway camp in May, so sign up for that! We'll have all sorts of diabolical exercises available =)