lol now that I don't plan on doing. So let me get this right. I enter the BF in the first act to which I know there are 4 sections:

1: The Merchants- Quests can be found here and the oppurtunity to purchase/Sell items.

2: one portion of the Forest area which includes an entrance.

3: another portion of the forest which again includes another entrance (and if this is your first trip will be locked)

4: yet another portion of the forest with yet another locked entrance on both the first and second trip here.

So if on my first run through i go through all 4 of those sections and take out the bad guys I will not be able to fight additional monsters here until the Second act?

I ask because upon obtaining the second BF key I went back still during act 1 and there bad guys had respawned where I had killed them all upon entering when I found the first BF key.