Was it really the Arc Warden though? Even if that were scripting, he would’ve had to turn around a bit to hex that Tide. Then again, that mouse movement looks completely sus.
Anyway, I think Hoodwink was the one who used hex, but that Arc Warden is most definitely doing weird shit.

Video recording for 27:54 to 27:58 - https://streamable.com/dqhxqs

Scripting? It looks sus because the cursor goes straight to the Tidehunter, back to the original position. It does this 2x in quick succession in a very precise way.

You caught red handed. Punish him!

Match ID for context: 7427552568
Timestamp: 27:58

This vexes me!

Either precasting, or scripting.

Arc Warden player? Then you can assume the latter if it was too unbelievable and too consistent.