[Gameplay] Nocturne often is able to continue to autoattack characters who leave his AA range

When leaving Nocturne auto attack range (by a considerable margin) Nocturne appears to be able to continue to auto attack the target for up to a second.

Steps to Reproduce:

1. Launch a game with Nocturne and any other champion possessing a movement ability or the ghost or flash summoner spells
2. Have Nocturne auto attack your character
3. Use any form of accelerated movement or flash effect to leave Nocturne Auto attack range

I haven't seen enough Nocturnes lately though I imagine it would seem to be inconsistent issue 3/10. However I've seen it enough to believe it is not simply the result of delay or latency.