The legs were actually designed to dampen the impact and use that energy to drive ice screws into the comet: https://www.youtube.com/watch?v=-77-Z_DHTlY#t=1m40

The legs were actually designed to dampen the impact and use that energy to drive ice screws into the comet: https://www.youtube.com/watch?v=-77-Z_DHTlY#t=1m40 https://www.youtube.com/watch?v=-77-Z_DHTlY#t=1m40