Garentied Crit (bug?)

So I was looking at 's e and thought that it would be really cool if worked with it cause with his ability to decisive strike in then spin to win he would nearly always get a kill with the 100% crit. So I went and tested it out in a bot game and you do get the crit if you use e within 3 seconds of activating this means you can auto q e or q auto e for ridiculous damage. I realize that rushing would be a bad idea cause you get little use out of asi as as a 4th item this would make him a stupid team fight monster (hello aoe crits) or make his split push really good cause he can actually use the asi vs towers.

Thoughts?