Christmas Grenade

Ok, so one time I was playing mutation mode and i saw a oneshot kill hacker killing all the mutants. So, i got made and threw a christmas grenade at him and he died?!?! I checked with a regular grenade i had in my other bag and he didnt die? So, i went back to xmas nade and threw with at the very beginning of the match and he died again. People then started calling me a hack and kicked me. I also found out that the nade only kills people who actually use the one shot kill hack. it only works in mm mode though. I was wondering why was this happening, and if any1 does have the christmas nade, then I hope u start killing the hackers in ur mm mode games. This even works if they are a mutants and u throw a christmas nade at them even if they have full health. Sorry for the long post:). Also this is my first post, so if this was obvious please dont be mean