Lightning Flash pathing
Lightning Flash is a Shadow Step, not an actual teleport like Guardians. Keeping this in mind, here’s the rules as I have found so far.
Using pathfinding to determine distance, you can teleport to anywhere unaltered pathfinding can get to depending on the route it has to take.
Keeping this in mind, and the fact that path finding seems to mess up for some reason on stairs, corners, and different elevations, it gives you a better reasoning to why it just doesn’t freaking work half the time.
Basic tips:
Don’t use it on/thru stairs.
Don’t change elevation.
Don’t try to go over a gap.
Don’t try to get to something that you cannot walk to without jumping over (sometimes even low walls).
There /are/ some exceptions to this, but it’s only in certain areas it seems.