Based on the new screencaps, I think Gary and Mallory did the search, like Zev and Justin did. Gary was holding a tool that was exactly like the one that Zev and Justin had. Gary went in the hole they dug and pulled out the dummy! That was Kent and Jen in the crevasse.
Caps 14, 15 & 16 are Gary & Mallory digging. Cap 28, Gary in the hole, pulling up the dummy.