Scenario:
A large-size troll is standing at one end of a 35 ft by 10 ft hallway. A medium size fighter is standing at the other end. In middle of the hallway is a medium size rogue. The rogue made an amazing stealth check and is hidden.
The troll tries to charge the fighter but must pass through the unseen rogue's square to do so. Since the rogue is an enemy, rules say that the troll can't pass.
What now?
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Scenario:
A large-size troll is standing at one end of a 35 ft by 10 ft hallway. A medium size fighter is standing at the other end. In middle of the hallway is a medium size rogue. The rogue made an amazing stealth check and is hidden.The troll tries to charge the fighter but must pass through the unseen rogue's square to do so. Since the rogue is an enemy, rules say that the troll can't pass.
What now?
First of all, the rogue can't be using Stealth if he's in the middle of a hallway (unless the lighting is very low or he's got Invisibility).
But, let's assume the Rogue is invisible. When the troll charges, the troll would either run into the Rogue and would then know that the rogue is there, but would also provoke an attack of opportunity from the rogue when doing so because he's moving through a threatened square, so the rogue would get to attack before the Troll runs into him. If the Rogue decided NOT to take his attack of opportunity, it's then HIS choice whether he wants to dodge out of the way of the oncoming troll or if he wants to block the troll's path. If he blocks the path, the troll would stop at the adjacent square, and would know that an invisible person is in front of him, because he ran into said person.
What's the Rogue hiding in/under/behind? A good stealth check doesn't mean diddly if you're standing in the middle of a hallway in pain sight. The rogue has to be out of sight somehow or be invisible.
Anyway... In a case like this, I'd probably say one of two outcomes:
1) If there's nothing actually concealing the Rogue (cover, invisibility, any other hiding magic), the Troll would actually be charging the Rogue first, then the Fighter.
2) If there is something concealing the Rogue, I'd treat it the same as moving through a threatened square.
This is an area where the game rules don't really take into account real-world functioning... unless the Troll doesn't mind Over Running the Rogue. That could work, too.
Actually, that would probably be the more correct answer. Just make an Over Run check...
1) The point is not how the rogue is hidden but that there is an unseen creature in the way.
2) I suppose overrun rules would work best.
This begs the new question of: What happens if he wants to walk up and just stop in the unseen person's square? Bull Rush? He stumbles over whatever is in the way (no mechanic, just flavour) and stops before entering the square as he realizes something's in the way?
You may not stop in another creature's square (barring some special ability). You would be returned to the square you came from.
Generally I allow a hidden PC (or NPC/monster) to choose to allow an enemy to pass through its square just as an ally would OR to block passage.
If it blocks passage the creature moving knows there is something there but can not continue.
If the hidden PC/NPC allows the passage then I give the moving creature a Perception check to notice something when they move through the square.
I play such situations as an overrun. The invisible person can choose to allow the charging monster to pass, or try to block. Said monster then makes an overrun attempt.
It would be silly to simply say charging troll impacts a halfling rogue, for example, and immidiately stops all forward momentum arbitrarily.
This is how I would process this one. Troll charges, rogue can move or block. If the rogue moves, do an opposed overrun (for troll) vs acrobatics (for rogue) to see if he gets clipped. If the rogue blocks, do an opposed overrun (for troll) vs rogue's CMD.
Failed overrun means the charge attempt botches and the troll is now in front of the rogue. Passed overrun means the troll can still charge the fighter and the rogue is knocked out of the way.