Fenris - you are wounded but not critical. As I said before, you are at the D&D equivalent of seriously wounded (50%). You can walk, shoot a gun, or whatever, just not as fast as you would normally.
Brakes - The brakes work, but they ain't gonna hold forever. I would advise you treat the mule as wounded, but not critical (same as the driver

).
Stage mule - interesting idea. I didn't think of that.
The crucial piece of info you don't have yet, and I will do a small post to recify, is that the teller and Sam need help now. The ship may be too far away. Furthermore, if there is an alliance "eye" on this area, going back to the ship is gonna lead them right to the ice.
The doc's office is less than 60 feet away through the back door, and he does have a fully stocked and relatively modern operating room. So let me post that so you can act upon it. I was hoping that Vanadia would be able to post first but she is busy with work right now.