I don't know exactly what you have issue with but I'll try and clear it up since it honestly would probably be a very complicated ability to use in practice.
When you use it, you knock yourself backwards, making you move backwards through the air at an angle based on where it’s pointed. You can change the direction you face to change the direction you’re being knocked back (the opposite way you’re facing). It does a little damage and if you collide with somebody the ability stops and goes on cooldown. The hit enemy is stunned and dealt a little damage. You can cancel it by pressing F (or whatever button on console), though it will work with other abilities. So in other words, probably the hardest mobility to master in the game if it is ever implemented, but it’s very rewarding as it gives you access to a LOT of mobility for a tank… Plus you can attack people from the air.