Gabbro shakes his head.
"No, that's wrong. Sorry, everyone - I got..." Gabbro trails off, realizing that if he admits he got confused, the party will be completely lost, as he's the only one of them mapping. So he continues,
"...I got it wrong. My mistake. We're here on the map; the most direct route would take us out past the feet statue again, continue north around the edge of the trap door (holding our noses), and from there, it's pretty much the same as what I said a moment ago."
If no one objects, Gabbro will head out. Though they have been through this particular portcullis maybe half a dozen times already, he thinks nervously about the green slime as he hefts the portcullis to the room with the feet.