Don't mind the feeding :
LeBlanc sent her clone behind me, it got spotted by the turret and took a turret shot, then died while casting it's spell. After that the LeBlanc icon stayed on the map until she used her ulti again, and this outline of the clone could be seen, untargetable by spells and auto attacks. We didn't have the necessary champions to test if it would block skillshots. Haven't been able to recreate.