How much can Berak see from where he is standing? Can he see that they are coming?
Is Berak naturally hidden in his position or does he have to use the stealth skill to stay unseen? Actually, it would be nice if there was some kind of guideline like "if less than 20% of the square you are in is visible to the opponent, (s)he/it can't see you", so that I wouldn't have to keep asking things like that all the time.
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Does the door open outwards of inwards? Because I'm wondering whether we could slam the door closed after the human enters and hold it closed, so that we could off him before the dwarves can enter.