Just at that second, the residents of the cottage (who happen to be Istanbul, Killer Joe, and some Nightstalkers) return and find Ransac hold the bag of jewels.
Nightstalkers are ready to attack Ransac, when Istanbul (for SOME reason) tackles Killer Joe and Oversoul runs into the path of the charging Nightstalkers.
Perhaps it was the sudden threat of danger that Ransac decided that, while everyone was fighting amongst themselves, now would be a great time to escape.