Evidently MOST of their bodies are fairly fragile. I'm not speaking about the reptoids.
But their technology and mind control stuff is so quick and effective that even people sleeping with a loaded gun in their hands are prevented from being able to move their muscles in any respects other than breathing and moving their eyes.
And in a few cases, the person outside like in a meadow or some such, has happened to be hunting and saw the ET's and fired the gun at the ET, and then things got strange, it was like reality slowed down. The hunter saw the bullet leave the gun, travel slowly through the air a few feet and fall in a slow trajectory to the ground harmlessly well before getting near the ET who wasn't anywhere THAT far away--say the ET was only 20-30 feet away and the bullet fell within 3-5 feet of the end of the gun.
Books about resisting ET abduction speak of at first HINT of awareness, winding up your fierce anger and speaking very authoritatively in resistence etc. If it's not within the first miliseconds, evidently their mind control or whatever technology prevents movement on the victim's part.
That mind-control stuff is scary.