The story is suspicious. And there is a lot of mythical hokus pokus out there. Maybe a doctor can chime in, but here is what I know about drugs like PCP, cocain, acid, etc etc...
For our purposes, these drugs have the same effect on the brain as massive does of adrenaline...
They do not give the body any special powers beyond what the body is already capable of. The kicker is that the human body is capable of amazing things, we just have this thing called out brain the prevents us from performing these things because we might hurt ourselves. For instance, try to bite off your pinky finger. Can't do it? That's normal, your brain and your nerves prevent you from doing this. But it only takes the same amount of force to bite through your pinky finger as it takes to bite through a carrot. Psychoactive drugs like PCP remove the brain from the equation. To put it in other words, they let you bite off your pinky finger.
But the action is not limited to something as trivial as biting off your pinky. You've heard stories of people lifting cars so that their loved ones can escape out from under them? That's because the body's adrenaline rush removes the brain's perception of pain and limits and allow your muscles to perform to their max limit. We do not perform at this limit naturally because muscles in max strain can break bones, snap joints, and rip limbs off if they are not checked by the brain. Again, PCP removes the brain from the equation and lets the muscles operate at that level.
These both tie into the phenomenon that we experience when people on these drugs "take massive amounts of damage" before dying. In a normal person (you also see this in animals), life-threatening injury produces shock. This is a survival mechanism, the body shuts down anything not IMMEDIATELY needed for survival and concentrates on that immediate survival. So what constitutes not immediately needed for survival? You don't need to control your legs to survive immediately (in fact running will only cause more blood loss), so you'll lose control of those, you don't really need to see to survive immediately, so you will lose sight, in fact, you probably don't need ANY of your senses to immediately survive, so you will probably black out while your body tries to stem to flow of blood and pour as much energy into trying not to die in the next 10 seconds as is possible. When someone falls down after being shot (and most people don't even realize they are shot due to the effects of adrenaline), this is almost what is happening. They were not knocked over, they are not dead, they are in such shock because "OMG I JUST GOT SHOT" that their body enters into condition red and concentrates on one thing: damage mitigation.
But people on psychoactive drugs do not experience this because it's like their brains are constantly producing massive amounts of adrenaline, they do not experience the normal reactions that people should experience; their brains are not filtering. But these drugs will not magically harden skin and bone and let people get hit by a speeding truck only to get up and keep running with two broken legs. If they would have died under normal circumstances, they will still be killed be the action even under the effects of PCP.