Everyone Else: After heaving the gateway up, bearing the load of it is far too tough to maintain for any three ordinary men. You must set the gate down after a moment or so, long enough for Gregorian to stealth on through the measure. Painfully unaware as to what is happening to your friend, you are left in the passageway that you traveled down.
During one of the calm moments, the ones where little is said or done by anyone save waiting, hoping, for the gate to rise, you all become frantically aware that something is peering down the hall at you. Made of the same dark brown cavern rock as the rest of this dull place, looking something like an armadillo if you've ever met one, is the body of a tiny stone construct. It's beeding antennae staring forwards at the group.
Once aware of this fact, it becomes apparent that the spy is not without company, six spidery looking bronze critters lay in wait behind it, as if waiting for it's very commands. Each of those such creatures is armed with a rotary blade of some-kind in the front of their unshapely mouths. The stone creature looks far less intimidating, bearing no weapons except for it's fly-like antannea. They all appear infinitely patient and motionless, in observasion of your group.
(was going to delay this till after Gregorian's first post, so he still can supercede this post and comment "before the door had to be let shut".)