I'm in the high teens on breakdown where there are mobs of screamers everywhere (bloaters have literally vanished -- is that common?). I usually get leapfrog for my reflex characters. I've played a bit with the instant counter, but find it a bit unreliable. I normally use it when I get mobbed, similar to pro wrestling. However, I accidentally found two other uses for it: 1) When screamers are inhaling, the leapfrog interrupts their upcoming scream and puts them on the ground (unlike/faster than melee attacks, I've found). 2) When used against sitting zombies, it prevents them from being able to do their usual launch-themselves-at-you routine. Not the most earth-shattering perhaps, but kind of interesting, especially given the many screamers I'm encountering right now. And it provides another option for sitting zombies, as I normally combat roll or shoot them.