Zac running in air with his E,typing CTRL 1,2,3 or 4.

Recently i discovered a bug i think,at the time when Zac is in air with his E,typing "CTRL 1,2,3 or 4" Zac will run every time when i use Zac's E with him and landing normally dealing damage. I tried this on Twisted Treeline and Summoners rift.Results are same. Here are some pictures:

Summoners rift: http://postimg.org/image/ai9z5hxgx/ Twisted Treeline: http://postimg.org/image/r91nsgwcn/

I hope you will tested it.