Azar the Gish's turn.
He casts
Dispel Magic, targeting the 'magical effect' (Telekinesis) that he saw you cast on his dead first mate.
I had to Google this, to see if your staff could absorb it, but as he is not targeting you, and is instead targeting the spell (the spell is its own discreet 'magical effect' as per PHB 201), you cant absorb it.
He uses his 5th level slot (because other than 1sts and 2nds, that's all he has left) and your TK effect ends.
On a positive note, as Dispel Magic also has Verbal components, he does reveal himself after casting it (he was hiding in his room on his ship, and peeking out the window).
After casting it, he then ducks back out of sight (but not hidden) to obtain total cover from the Archer than shot him to pieces last time.
I just meant if he's hiding we can find him. If He's hiding AND invisible it's harder. We have something to deal with the invisibility and just have to contend with the hiding.
Invisibility doesn't make it any harder to find him, the DC is the same. The spell just lets him hide in circumstances where he couldnt (he always has heavy obscurement) and it gives him the advantage of the condition as well.