In the first Pinger battle, it's suggested that it has a weak point at the back, and you should concentrate your fire there. This is shown visually too, by the back parts being red, like other enemies' weak points. But when I attack later Pingers (in 'Soldier' difficulty), it seems that it takes 6 JAW hits to kill it, regardless of where I hit it. Is it just that I'm not managing to hit the right point? Does the weak point only make a difference at harder difficulties? Or perhaps the weak point only applies to bullet weapons, not the JAW?
What's really going on? I'm struggling on my Pinger battles (especially in 'Power Out') because I spend ages trying to get around behind it, seemingly to no avail. I'm on PC, with the non-Steam version, if that makes a difference.