A good question. I'm not sure how the people who were left behind would know. I'm sure they have a goal in mind, so maybe the people sent with us come back and compare notes on how things were when they left and how they are now after they changed it?

[Just shrugs and shakes his head. He has no idea.] One day they'll make a change and come back and it bit them in the ass.

The back stairwell. A corner of a building close to the shopping district. Somewhere it wouldn't be odd to stop for a second and adjust your shoe or something. The sign could be a circle with a hash on it to say what time. [Draws a circle in the air with his finger and then draws a line from the center to the right.] Three o'clock. Six o'clock. Nine o'clock. Make the assumption that it's night time unless it's an emergency.