OOC:
Octopus, this is exactly why I wanted to do a test run. You have, in this simple simulation, pushed the bounds of the system to such excellent degrees, as to ask questions I have yet to answer. Bravo, my friend!
Putting aside the question of teleporting from the sky area to the small room, there is a matter of rules. Your powers only affect a certain radius around you. Anything outside of that radius, you cannot teleport, and you cannot teleport yourself farther than that maximum range. If the small room is in the same Dimension as the sky area, it is so far away that you could not roll enough successes to get there. Now, what if the small room is in a different Dimension? Well, that would put it squarely outside of your powers in general. A Sector mage cannot cross Dimensions by teleporting.
Now, let's frame this differently: what if the small room and the sky area are the same? By that I mean, what if you are currently in the small room, but don't see it? If that was the case, attempting to Teleport from one place to another would not actually move you anywhere. Worst case scenario, trying to teleport in the sky area would cause you to teleport around in a place you can't see!
So, I guess there's only one thing left to do. Will you try to teleport to the small room?