i was on1337 server and used my knife like every time then i changed to the shotgun..... 1 shot 2 kills, how is this possible
I've gotten a double kill with 1 shotgun shot before.
Usually two people will be fighting each other, or just both at really low HP, and then when you shoot the shotgun, half of the bullets hit one and the other half hit the other. If their hp is low enough, you get two kills.
Like .Loki said, nothing unusual.