Because that is his order, and it is given.
Obligatory http://i.imgur.com/y5sjPDl.png?noredirect
[long list of champions with blinks]

[{quoted}](name=You Kat See Me,realm=NA,application-id=Ir7ZrJjF,discussion-id=Z3zRYqTg,comment-id=00010000,timestamp=2016-12-04T03:25:28.359+0000)
isn't a blink.
what is it then
[{quoted}](name=You Kat See Me,realm=NA,application-id=Ir7ZrJjF,discussion-id=Z3zRYqTg,comment-id=0001000000000000,timestamp=2016-12-04T03:55:42.757+0000)
what is it then
A mobile invulnerability, its as much of a blink as fizz's E / Kha's jump is.
A blink is an instant dash from point a to point b while avoiding any and all units/spells/objects in their path.
For example, if you ult as azir vs. ekko, ekko can blink (e) right through the wall as he's casting it, where as a kha'zix jumping would get pushed away the moment his model bumps the wall.
Elise is less of a blink as she just becomes untargable for a moment, and then drops somewhere with enough reaction time to punish it instead of instant (ww, ekko, etc).
I really don't know what the technical name for what fizz/elise's E's are. I guess just jumps.
I guess pantheon doesnt have a blink, because he jumps to a location lol.
The blinks are from the league wiki, so I'm rolling with that.
Point A to point B.
Akali can't W over his wall (at least i miserably failed 10 times already)