Quinn's E (no auto) procs thornmail damage

I'm really fucking tired of trying to e someone to get away and dying. If her e applies on-hit it should apply all on hit not just kill you when you try to bounce off thornmail.

Vault ACTIVE: Quinn dashes to an enemy, Airborne icon knocking it back a short distance, dealing physical damage and Slow icon slowing the target's movement speed by 50%. This slow decays over 2 seconds. PHYSICAL DAMAGE: 40 / 70 / 100 / 130 / 160 (+ 20% bonus AD) Upon reaching the target, she leaps off and lands near her maximum attack range away from the target. ValorSquare Valor will immediately mark this target as Harrier.png Vulnerable. ACTIVE - Tag Team.png TAG TEAM: Valor dashes to an enemy and applies the same Slow icon slow, Airborne icon knockback and physical damage, but does not mark or leap off the target.

On being hit, Thornmail will reflect 30% of the physical damage dealt by the attacker, including most on-hit effects.

If I can't apply sheen procs on her E, then I shouldn't be punished for trying to use it as an escape mechanism.