At level 12 there are two red doors.
The right door contains the dot operation, the left door contains the rest of the level.

If i follow the the left door, i quickly get stuck at the 'isOver' puzzle, since the dot operation is needed here. However, i am not able to go back to the red doors in order to enter the left one, since the text is removed and i cannot cross the gap .

How do i get back to the red doors so i can get the dot operator?