As they exited the last cavern before going into the tunnel that lead to the well, Laz turned around to put the rock back in place. Although they had wiped out the larger problems in the cave, that didn't mean that if the other spiders escaped that they wouldn't cause problems. Laz didn't feel like taking risks.
When they had originally come into the cavern, it took both of them and a huge effort to move the rock forward a few feet, just so they had enough room to get in. Of course, pushing out of the way was going to be much easier than trying to put it back. With Vivi staring at him while he stared at the rock, Laz just finally decided to give it a go. Amazingly, as Laz's hand latched onto the rock, the area where he grabbed crumbled away, as though he just grabbed on to a baked cracker as opposed to a one ton boulder. Watching the rock fragments crumble in his hand, he couldn't help but look a little wide-eyed at Vivi who was also staring at his hand.
"Uhh..."