((My subscriptions still don't work... I'm guessing that's been a problem for hafrogman too))
With careful steps at first, the group soon realizes that indeed the lever turned off the darts. And, in fact, now that you have the ability to look around, you see another lever just like the one near where you came into the room in the first place.
ah well...
moving out through the next door, you make your way down another long tunnel that eventually opens up into another room. As you begin to step in, you hear the clicking of metal gears and suddenly, from just above you, a portcullis drops!
((Make a reflex save))