Hello, today i've found something strange.

Annihilated at Level 219 by Bacana The Sorcerer, Boby Bougard, Chalby, Darken Shadow'Bolt, Fagaro, Isabelaa Calmon, Kung Feeder, Lord Slaanesh, Marales, Mariensa, Remgalag, Retrondor Thalyl, Riigon, Risatta, Sean dow, Tawik, Vendeetta, Vicious Square, Vinbert and Waleczny Komar.

Slain at Level 78 by Beloruz, Kevandi, Rizzon Gasiak, Tao Mentors and Yaninx.

Eliminated at Level 194 by Ackmed, Arkas Mage, Balaganiarz, Darken Shadow'Bolt, Elder Pythor, Fagaro, Fislow, Goo'zi, Imperish, Kung Feeder, Mormaih, Reymund, Risatta, Skalice, Slayerzinxz, Vadrit Dommel, Valkore, Van Sabeamixta and Vicious Square.

Crushed at Level 195 by Ai Shinayo, Fagaro, Griforium, Lendui Leath, Mamoc, Mariensa, Matys, Sean dow, Sivarius Drake, Valkore, Van Sabeamixta, Xa'xara and Zara Akan.

So far, people were killed by other players but not annihilated, slained, eliminated, crushed.
Can somebody explain me that ?

Depends on how many the fraggers on the victim is

yep, depends on fraggers :')