Hi, I found a way to kill these pain in the ass enemies, if you wanna know how read the following description.
1st Scenario (The Village)
There's a roof top in this scenario, near the closed gate that will be destroyed in a cut scene if you survive for few minutes. On that roof top, there's an electric thingy, if you shoot at it, it falls down, what you need to do is, 1st kill as much africans as you can, then, when you're alone on the top of the building, and the hammah man walks continuously down there, just wait till he comes closer to that thing, then shoot at it, and it will spread a huge electric wave, if you repeat this for 5-6 times (ps sheva also shoots at hammah's head using the sniper rifle) he GOES DOWN!!!!
2nd Scenario (Chainsaw man)
At the end of the scenario, before the chainsaw man appears, you need to go up and follow the stairs right? then he appears. Right, just stand at the beginning of the stairs, you'll see looking up the same electric thingy I previously mentioned. Looks like this game helps a lot to kill enemies without using ammo, good for us. Just do what must be done, once that thing falls down (if you shoot at it) wait till he comes closer and then shoot at that tool, again, repeat this for 5-6 times and at the same time shoot at the enemy, better if in the head.
now it's your turn! go kick some asses!