After Nocturne uses Paranoia and subsequently launches himself at a target, can he be targeted by either friends or foes?
For instance, it's been shown that Quicksilver Sash can remove the vision debuff. Could you remove the debuff and then stun him in-flight (removing the debuff so you could actually see him arriving)?
The answer for this should inform on what happens when a friendly Shen ports to a mid-flight Nocturne. The fact Shen can even attempt to port a mid-flight Nocturne leads me to believe he's more-or-less targetable, but I haven't seen any definitive evidence.