Mc202, ENY 50 vs Mosquito, ENY 25. For example in MA setup (same thing goes for CT).
The mosquito attacks the 202, the 202 turns the fight and get above the mosquito, the 202 gets a long tickeling burst into the mossie and the mossie dies.
Split the killers ENY with the Killed ENY. In this case 50/25 = 2.
So the 202 gets 2 perks, land the sortie, and the perks earnt during the sortie will bemultiplied with 1.25, that'll give the 202 2.5 perks after landing.
If mossie would have killed the 202, it would have been 25/50 = 0.5, that's only 1/4 of what the 202 gets for killing the mossie.