Why is Jarvan's QE allowed to be casted through CC?

Jarvan comes to gank me (im lux.) I see him bc the bush is warded. I root him and start to flee to turret. He still EQ's to me **after i've already binded him** and i then get jumped on and die. Why? Other champions cannot cast movement abilities if they are binded (aside from camille -.-). I know that neither of his Q or E are counted as movement abilities, but this should not be an exception. .
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