[Gameplay] Urgot E Spell ( Disdain) not interuptable by Quinn E ( Vault)

I play Quinn and whenever i play Quinn, i can't cancel his E spell and it's not stated anywhere as unstoppable but act like it is Step 1: Pick Quinn into Urgot Step 2: Use Vault after he use Disdain from any direction Step 3: Get knocked behind him as he ignore your knock-back from Vault entirely. Step 4: Repeat with other interuption with different character for same result.