You truly can't go through the final teleporter. Attempting to do so results in a small blood splash followed by a larger one as you get PUMMELED BY THE GIANT WOLF.
I didn't use it as morse code, I just saw it as dots counting up from left to right (.---- is 1, ..--- is 2, and up to 5 being ..... because they're filling in from the left) then moving past, leaving dashes behind.