The grenade resembles an incense censure used by the Roman Catholic Church, but without the chain. To activate the gas, the upper and lower halves of the sphere are twisted in opposite directions. The gas is rapidly expanding, and once it reaches it’s maximum area of effect, it slowly dissipates until ineffective. The gas contained within can vary, but it is usually some sort of sedative gas, which renders those inhaling it unconscious.
Using some unclear mechanism, the gas that emanates from these censures never affects allies of the Knights.