User blog comment:Martialmaniac/Chrollo, that chatterbox/@comment-14902757-20160717043130

1 - Plausible. He wanted Hisoka to realize the gap between their analytical abilities before he crashes Hisoka down.

2 - I doubt Hisoka could have figured out these abilities all by himself given that he had a hard time keeping up with how these abilities work (at least that's how I felt from reading the manga).

3 - A possibility. There would have been less interaction between the two if it was only the narrator who explained Chrollo's powers. Honestly, if Chrollo didn't explain to Hisoka what's going on, Hisoka would have fallen for each trick way earlier and his loss would have been boring.

4 - Hisoka wouldn't have figured it all out (like I said in 2) and that would have been advantageous for Chrollo but Chrollo still decided to reveal his abilities so this is also a possiblity.

5 -  He wasn't really reluctant, I think he was intent on killing Hisoka. (I haven't read the Hisoka backstory, if that is where this was based from)... In the manga, Chrollo still believes that Hisoka is already dead if I'm remembering it right.

I`d like to add another theory. I think Chrollo is confident that he's gonna win. He was demonstrating his powers, to perplex and at the same time give Hisoka a good fight before he dies. Maybe he thought he's seen through bungee gum. Unfortunately he didn't see through the possibility of it being used to revibe the heart.