Cho'Gath's W... (And Morde's E while we're at it)

So I was watching my friend play mid Kat against a Cho, rough matchup, but he avoided dying by shunpoing to tower to dodge q, Cho walks up just before recall ends, my buddy tp's to base, and a quarter second later he's dead. He looks at the death recap: Feral Scream killed him.

So basically my question is this: Why does Cho's W hit you even if you get out before he finishes casting it? What kind of skillshot cannot be dodged? The same thing goes with Mordekaiser's E from what I've seen.

Is this intentional? I feel like it reduces the opportunity for counterplay.