The condition of a Sime's nervous system which prepares for the full speed ripping of selyn from a Gen, causing the Gen to experience terror, pain and death. The surrender of a sime to predatory instinct.
See Hunting Mode. "Mode" is the term for various nervous states affecting Sime perceptions and behavior.
(Source: Index card file. "Killmode Transfer" -- attributed to Jean Lorrah -- February 22, 1977) Criminally wasteful of selyn. AMOUNT of selyn not as important as the QUALITY OF THE FEAR.
Sime is after an emotional experience of ascendency over a threat --- selyn repletion is only a side effect in the Kill, necessary but not primary.