Eying the rope, Gilgar takes one step forward. If it moves in concert with his step, there's an audible *huff*, then he growls "Damn... Passage looped. Backtrack." With that, he moves past his two companions to the last junction, and takes what is now the right passage (i.e. the "straight" described earlier.)...
As Gilgar moves, the rope on the floor does mirror his action. As he turns to push past the druid and the ranger, he hears the faintest of sounds. Something is close - too close. Before he can say anything, the tunnel is filled with flame.
Based on the Perception checks earlier, Gilgar and Graymoon are not flat-footed and can act in the surprise round. Nox, however, is caught off-guard.
Initiative rolls, please. Also, I will need a Reflex save from all three characters to escape or minimize the effect of the flames.
EDIT: Reflex DC 14 or take Fire Damage:2d6 ⇒ (6, 3) = 9. If you make the save, half damage.
Your foe got the drop on you, so he acted first. Gilgar and Graymoon detected him and get a turn before the surprise round ends. Gilgar is up first! The smoke is thick enough to obscure your target - 20% miss chance.
Strain as he might, the druid is unable to where the creature went or what else might be nearby in the smoke. Feel free to state a round's worth of actions, sir.
Nox will move forward till he is just in front of Gilgar, and will listen for sounds of the beast.
1d10 + 9 ⇒ (3) + 9 = 12 perception
He will contine to move forward slowly until he gets some sign of the beast, or some other, and will cast gust of wind to disperse the smoke at that point
Assuming Gilgar moves to accommodate the tightening rope as NOx moves away from him...
The druid cautiously moves forward, finding natural column on his left, then the wall on his right. He continues and finds the rough hallway makes a definite turn to the left. Full movement, still smoky, no dog-thing.
As he moves forward, the air becomes hot and oppressive. The sounds of a roaring forge and metal being worked begins to echo through the tunnel. If anything, the smoke is thicker.
You can smell it. The smoke is so thick, you can't see the ranger when you look over you shoulder, just the Druid to your left. Suddenly the ranger curses as the smoke turns yellow with flame from behind you.
Even as the creature's fiery exhale is just beginning, Graymoon is throwing himeself to the side in hopes of getting around behind it. Only partially successful in evading the fire, he hopes for better as he maneuvers.
Acrobatics:1d20 + 8 ⇒ (15) + 8 = 23
With deceptive ease, he finds himself behind the dog and whips the sword up and through an attempt to disembowel it.
Nox, having the spell readied, will cast 'Gust of Wind' at the creatures in an attempt to slow the creature and temporarily remove the smoke which has been concealing it.
There is a lot of swirling as the smoke (which originated behind you) is sucked into the vortex that the rushing wind causes and you hear cries of surprise from the allies waiting in the room outside.
The smoke is quickly cleared as the creature and Graymoon both set their feet as they are hit by the brunt of the gust.