What I wana know is, how did he reach the 10 in the 1st place if hes a dwarf?
The electricity went out as he hit the 5th floor....or someone got in and pressed the 4th, 3rd, 2nd and 1st floors so running would be faster then waiting for the 10th.
He can only reach up to the 5th floor button. The rest of the way he has to run up the stairs.