How can Chrollo steal Kortopi ability?

To steal his opponent ability he needs to :

1. See the target nen abilities

2. He must ask the nen user abilities and the target must explain it their abilities.

3. Touch the bandit secret cover book.

4.all of those 3 must be done in 1 hour.

Chrollo already see Kortopi abilities, Chrollo know about how Kortopi abilities work.

I thought the condition is if he see the target abilities, he needs to fulfill condition 2 and 3 in 1 hour like it become active without Chrollo consent.

Perhaps Chrollo needs to conjure his bandit secret book then to active the stealing? So if he did not conjure it, even if he fulfill condition number 1 and 2, he cannot steal it if he just conjure bandit secret, let the target touch it ? He needs to go to step 1 the moment he conjure bandit secret?