Invisibility! THE ULTIMATE SHADOW NINJA!!!!!

Hello Everybody,
I encountered a funny glitch today while playing. I made a video of it which I am uploading at the moment so you can have a look for yourselfs.
Here is the Link to Video: https://youtu.be/nf2XjUI38Uo
(Crappy Quality, my PC laggs while recording,... no Voice over,.... sorry I'm a Youtube-Newb)

So what happened you might ask?
I was playing with my Shadow chaos ice trapper and PUFF he evolved into the ultimate Shadow Ninja and completly vanished.
I did some testings and found out what caused it. Apparently when a Quartz Flask is active and Cast when damage taken triggers Phase run the character modell will disappear after phase run is over. So you turn completly invisible.
The invisibility can be broken by using a town portal, alt tabbing or even getting a Quest from a Wild Zana broke it (Video Proof).

So my Question is, is this my System which is causing it or is it a bug in the game. I think its kinda cool and would not like to see it patched out, but maybe it could cause problems with the skill interaction.

Have fun and plz try it on your system ;)

Ah thank you, I didn't find any posts about it ;)