*As of v1009, this skill does not require low health. It is now nowhere near as elaborate as the classic Furious D.
Some fooling around with 1v11 and 1v5aggro'd • KF2 v1007 - 1 Zerker vs x Scrakes, 54 hp S...
So after taking a look at https://docs.google.com/spreadsheets/...
what really started to catch my eye was stumble power, zed's stumble resistance and zerker's furious defender perk skill.
Here are the numbers :
Pulverizer
Leg Stumble power 118
Leg Stumble power (explosion) 135
Stumble power 118
Stumble power (explosion) 135
Nailgun
Stumble power 120
Leg Stumble power 120
Scrake
Stumble Resist(low hp) 125(135)
Leg Stumble(low hp) 125(135)
Zerker Perk
Furious Defender +5% stumble per 15% hp lost.
@46 hp lost (54) nailgun is now 138
pulverizer no boom is 135.7
54 magical hp for scrake stunning.
What I found out was that Stumble has 2 locations, upper body and lower body as stated by Stumble and Leg Stumble. With a scrake as long as you wait 3s for each one you can keep them stumble locked.
At 54 hp (55 acted like only 2 stacks so I assume you have to actually be under 15% for it to take effect) the nailgun(vlad) has 138 which is higher than scrake stumble resistance at even low hp bonus (135). That means that you can shoot the head, delay a bit, then shoot the thighs/legs, delay a bit longer (as the lower body stumble is a longer animation), then repeat for an infinite stumble lock. You can even reload your Vlad in the time that the lower stumble animation is finished. With some luck and good aiming you can even keep multiple aggro'd scrakes at bay, you'll just need to EMP for reloads.
After I did the calculations for the pulverizer (no alt) to be 135.7 with 54hp, I even went ahead and killed the scrake in an infinite stumble lock.
I don't know if this is how the developers intended the Zerker to be played but it's super counterintuitive for teamplay and super awesome for solo play.