In another case I pinched the tube while seating the tire, the tube crept out and was rubbing against the brake, but I though it was ice accumulation. Interestingly, even though the tube outside was already rubbed through, the tire kept the air for as long as the tube was pressed to the rim. I just released the brake, pumped up the tire and made it somehow to my destination in time.
yikes! you don't hear that every day! good job keeping your "cool" & getting home