I am not sure if this is an intended interaction but... If an enemy nocturne casts ultimate while you are channeling predator, it instantly cancels the channel. He did not cast his ultimate on me. Simply the effect of Paranoia was enough to cancel my predator.
It's probably because nocturne ult debuffs you.
Paranoia
TARGET RANGE: 2500 / 3250 / 4000 EFFECT RADIUS: GLOBAL COST: 100 MANA COOLDOWN: 150 / 125 / 100 Paranoia FIRST ACTIVE: After a brief delay, Nocturne applies Nearsight icon nearsight to all enemy champions for 6 seconds. SECOND ACTIVE: While Paranoia is active, Nocturne can reactivate it to Dash dash Unstoppable icon unstoppably to the target enemy champion, dealing them physical damage. PHYSICAL DAMAGE: 150 / 275 / 400 (+ 120% bonus AD)
Predator
PASSIVE: Boots gain the active effect PREDATOR. The active is disabled for the first 150 seconds of the game. ACTIVE - PREDATOR: Channels for 1.5 seconds. You can move while channeling and the channel will be interrupted if you cast an ability or enter combat (except minions), putting the item on a 50% cooldown. Activating Predator will not break stealth. Upon completion, grants bonus Movement speed icon movement speed for up to 15 seconds. Grants 67.5% bonus Movement speed icon movement speed for the first 1.5 seconds, reduced to 45% afterwards, until your next attack or damaging ability, which deals 60 − 180 (based on level) (+ 40% bonus AD) (+ 25% AP) bonus Attack damageAbility power Adaptive damage. ADAPTIVE DAMAGE: Deals either physical or magic damage depending on your bonus statistics, defaulting to physical damage. Cooldown 150 − 100 (based on level) seconds
