Gaven, with some help from Varros rigs a mechanism using the 10' pole and a bit of rope to yank the trip wire if and when the right movement presents itself.
The cleric then hides behind a rock just north of the entrance in a position to either spring the trap or try to prevent escape of any body that isn't incapacitated, and Varros then moves off to set up with Duran behind a pair of rocks to the southwest. The mercenaries take positions hidden behind tree trunks with Gweneth and Jack directly in front of the bandit lair, and Stan, armed with only a short bow, a bit closer behind a trunk just south of the cave mouth. Oloc stays a bit farther back, behind a boulder to the northwest, staying out of sight of the fighting . . .for now.
Having already received his instructions from Oloc, Flox makes his way back into the cavern to try and draw out some of the other bandits. Only about two minutes pass before Flox quickly returns – not with the two to three bandits Oloc had instructed him to bring out, but with seven bandits in tow.
None of the bandits seems to notice Gaven's rig to set off the trap. "Come on, it's out here," says the charmed Flox to his comrades. Flox carefully makes his way over the trip wire and to the outer side of the waist-high barrier just inside the cave mouth. The other bandits begin to follow, a couple at a time, carefully picking their way over the wire.
The first two bandits following Flox are just making their way over the wire.
I wasn't sure whether to put the oil in there or not – Professor P proposed using it now; Dienekes suggested waiting; we can retroactively add that in before the fur starts to fly if you like. If you opt to use it now, please let me know exactly where you've positioned it and how you intend to light it.