I have a question about how to split after King Boo. Rules says "ends on collection of King Boo's Crown", but I've seen two ways to split here: At the beginning of the animation, when Luigi takes to crown, and at the end of this animation. Which one is the correct way to split? Thanks for your answers

Timing officially ends when King Boo pops into your vacuum. It's when you hear the bling sound from touching the crown. (It's the same sound as any other gem)

ok thanks :)