Takng Key Items from Inventory problem

Hey! I'm quite new to RPG Maker VX ace, so I apologise if I'm missing a simple answer.

So onto the problem. I have an NPC that stands in front of a doorway, and theoretically should not move until the player gives him a certain item, the item being a talon you get from a boss. I have used choices, so that if you press 'Show talon' he will take the key item and move. However, he moves even if you don't have the item. The formula I used was [Dragon Talon], -1. Any ideas how I could solve this problem? Thanks!

Can you post a screenshot of the full event?

Actually nvm. This should do it:



I didn't do it this screenshot, but make a new page, and check the Self Switch, you can make him say anything you want, but doing this makes it so he won't go through the first page again.

Thank you very much, I have fixed the problem.

Glad to be of some help, good luck!