[Gameplay] Skarner's passive procing on turret.

Here is the story: I was playing Skarner on solo top lane in bot game. 2 enemy bots left the lane due to low hp, I was pushing to deal some damage to their red outer turret. It was very early game, so Fortification was probably active yet - I didn't pay attention to that, I was just pushing with auto-attacks and Q spam. When me and my minions finally reached the turret, my first auto-attack... turned turret's texture into crystal blue, same as used on units that are affected by Skarner's hard cc.

I don't know whether it was just a texture change or I dealt bonus damage/stunned the turret - at early game it lasts only 0,5 sec, so I didn't have time to check it's debuffs or make a printscreen. I wasn't recording it either.

Items: Flask and Tear Summoners: TP and Flash Skin: Classic

The bug occurred only once in entire game, and so far I couldn't reproduce it.