Helmet Check. GoPro Check. Anything else? Let's do this! Fortunately for these guys their Altitude Awareness Device was working properly and automatically fired a backup chute deployment giving them little time to realize the extent of their situation until they slide into a corn field.
Notice how the first attempt to check altitude is after they're comfortably placed on terra firma. A little late. Three skydivers forget to pull their cord, and three AADs fire and prevent natural selection.