The noise marines seem to have utterly failed at their purpose in life, and since their lives revolve around rolling giant, man sized dice, they need to roll a 7 or up on a 6 sided die, and since there only six sides on a six sided die, all but one instantly combust into a cloud of a purple, MDMA (ecstasy) like substance.
The one left behind then gets crushed by his own man-sized dice, instantly causing a painful death.