That means Ed is needed twice over, along with Clark. He glances back and forth between the back of the ledge and Maloker, then says, "Okay. Here goes. Hope this doesn't result in a sinkhole on the surface." He claps his hands and gets down on one knee to start extruding out the ledge to get them as close to Maloker as he can. He has to use the earth surrounding the cavern to do it—hence why he's worried about opening up a sinkhole on the surface.