Warden Naut hook animation bug/exploit?

Played against a Nautilus using the Warden skin.

He wasn't walking but gliding. At first, ithought it was latency or packet loss. My ping was 24 and others in the game could see it too so I know it wasnt just me. Anyway, when he would throw his hook, there was no animation for it. It was invisible until it landed - whether it hit one of us or missed. We did not see it being thrown, only when it landed. This 'went away' later in the game and he was walking normally and the hook animation was fine. WHich is why I am posting it here since it MAY be a bug or a known issue that this evil doer was using early.

Has anyone seen this and is it a known bug or exploit?

NOTE: this happened when in the bushes as well as standing in the lane... and only while Naut wasnt playing his walking animation but was sliding/gliding around.

Thanks.