it was just.... end of the previous ep:
Chrollo:
hey, guys. Hundreds of the most powerful gangsters in the world are gonna be there. Just kill them all and take all the stuff being auctioned.
Uvogin:
wait... that's gonna make us the enemy of the entire criminal underworld! You want us to just.... kill them all?
Chrollo:
yeah. You scared?
Uvogin:
Hell nawl! Lets murder they asses!
Now, any other anime would've had them spend 3-5 episodes planning and plotting, infiltrating, maybe bumping heads with the heroes and possible being thwarted, with them maybe stealing some secret treasure that was needed tp advance the bad guys' plan.
Noap. Auction started at the very beginning of the next ep, 100+ gangsters walked in, bad guys walked out on stage and wiped them out.
for starters. I wasn't ready for Shizuku with the vacuum. Totally unprepared. Then they killed two new cast members right off the bat.
That flat out obliteration of shounen tropes was just..... jarring.