Im afraid from what i see this only works on a flying mount - but if you cant use your heroic leap to get to a location due to "no path available", then if you mount up you and fly like 1ft above the ground then select the same area where you couldnt jump before you can now leap there, bypassing terrain and walls etc. This may be useful or not, on doors and areas in flying zones that you normally cant bypass - move your camera over a wall or up in the air to select a leap location behind an object or terrain - this may be useful in raids that have flying abilities or some other stuff /shrug
Sorry if its useless but may be useful for someone and sorry if its a re-post dont have time to research atm.
- have fun
- Edit : the marker even though remains red allows you to still leap when you click it - just dont be out of range or it will fail - but ignore that the landing marker is red and un-available.