Script Area triggering twice? Why?

[FurtherGames]

So, I created a script area so that if the character tries to process before they read the note, it turns them to look at the note and tells them to read it. Fair do's, everything is fine. I've even set up a block box so they can't sneak past the script area. But one small problem.

As they leave the script area, after just triggering it, they trigger it again by walking out of it. I know setting the

AddEntityCollideCallback("Player", "ScriptArea_12", "Func7", false, 0);

"false," part to true would fix the issue, but this would mean that the script area would deactivate itself/not work again if the user tried to walk on without the note. Would making the script area thinner work or am I just going to have to deal with it? Or set it to "true" and let the block boxes do the work, just no message.