I was a bit worried when I saw my kill count for the event was lower then I thought. It made me think that the kills only counted to the victor but it went up later to the amount of times I have fought her so yes it doesn't matter who lands the last blow it's everyone.
An intersecting game with all four players means 4 kill counts in under ten minutes.
http://www.youtube.com/user/Starsoulklr I'm an Ultra Nerd for Video Games so see what I've got for viewing.
i'm playing as Ada for the Event, Been intersecting 90% of the time mostly with randoms and i ran into DarkPriest's Game XD, i'm lazy but i'm killing deborah still, it's really easy, i want all my EX3's so i'm doing this Event as best as i can ._.