i meant out of nowhere for me, wasn't expecting to get it especially since i just started getting more into pk

No, on the contrary, differentiating between actually random people and alt accounts is actually nigh-impossible. Somebody could have "FrigidLeopard4162" snipe them, pretend to play badly, and nobody would be able to tell it's faked.

Would unfortunately be very easy to fake, there's nothing stopping people from having a friend snipe them on an alt account with an Xbox-generated username and then lose on purpose.

"More than 50% of the game" sounds a bit ambiguous to me, maybe specify that the opponent must be in game for 100% of the whole duel?