spacewalking tethers

[warcrimes]

This isn't a very easy patch, especially because we don't want the tether passing through walls

Honestly im willing to suspend disbelief for some kind of "laser tether" that ignores tiles. 
Here's what I envision: 
 
The gray tiles represent the walls.
In this scenario, the player (green) places their tether on the orange tile. The yellow ring (and red outline) show the maximum distance. . The player moves off north. once they reach an identified limit tile, you check if they hit it perpendicularly (i.e. left from the orange tile) or some other secant. Being offset here, they start to swing along the yellow tiles until they hit an obstacle, and stop on the red tile.

it's jank movement but it's simple