Can we give Hecarim E some counterplay?

He gets a massive speed boost, clicks on someone, and unless they get out of this rampaging monster's range they're going to take damage and all on-hit effects he had... including Sheen.

There are games when you play an assassin or fighter in the jungle, you're really ahead, then you see Mr. Goody-four hooves come outta nowhere. You think, "I have a 3k gold lead on him, I'll win this fight handily. But then you realize he has Sheen and he basically takes half your HP the moment he's locked onto you. So you flash away when he gets near, preferably over a wall. Lo and behold, he follows you because his E follows you harder than a Nocturne ult. Then proceeds to body you.

I'm fine with Hecarim's strongest ability dealing a lot of damage, but why does it hit even if you flash? In my opinion it should fizzle out if you successfully flash out of the charge's direction. This ability has no counterplay besides either "have CC" or "don''t be in his range, dumbass."