FIDDLE STICKS ZHONYAS EXPLOIT/GLITCH

Whilst playing on my fiddlesticks i discovered that Fiddle Can activate his ult into the masses of a 5v5 teamfight, then immidiately pop zhonya active, and his ult will continue to work as normal damaging everyone in its vicinity while keeping Fiddlesticks invulnerable! this is massively OP in teamfights! and I would consider this an exploit since Zhonyas is supposed to stop all damage incoming and outgoing from the champ who activated it. Please rito. I was righteous enough to report this once discovered.

Once zhonyas is activated > Fiddle sticks ult cancelled / Cannot cast spells