If you throw a Molotov at a downed enemy, in return, you can steal anyone's kill. If you see a enemy on their hands and knees, got a Molotov? need a kill? throw it at them while they are down and boom the kill is yours, even if you didn't shoot them to down them.
You new? This been around since beta used to be able to do the same with a gas grenade or smoke grenade as well, just the Molotov isn’t that bad kind of incentivized people to pick them up
