I can see how it would be easy to get some unintentional friendly kills: You are in Ki-67s with some squad mates following. While shooting at some blue planes, your drones put a few rounds in the some trailing 67s. You kill the blue planes and the 67s you pinged crash or get shot down by ship ack giving you the kills. If you put a single round into a friendly (or enemy), you own it until another player puts in two rounds. If the guy that put in the two rounds dies or towers out, you own it again.