Bug with Sion E, Stalker's Blade, and Smite [GAMEPLAY]

If Sion has Stalker's Blade and smites a jungle monster while it is knocked back by his E, the smite will do damage equivalent to the damage of Sion's E.

How to reproduce:

1. Play Sion with smite
2. Buy Stalker's Blade
3. Attack any large jungle monster
4. Move back slightly, causing the jungle monster to move forward and chase you
5. E the jungle monster into a wall
6. Smite the jungle monster while it is knocked back by your E (It will not work if you smite after the minion hits the wall) The jungle monster will take damage when you smite it and when it hits the wall. The total damage taken by the jungle monster is the damage of Sion's E times 2

See video for more clarity on the procedure

The glitch occured every time the procedure was done correctly