I did have facehuggers in my original draft," he told Empire. "David, as he began to get fascinated by the science of the Engineers, doesn't deliberately contaminate Holloway with a drop of black liquid. Instead, Holloway hubristically removes his helmet in the chamber, is knocked unconscious, facehugged and wakes up not knowing what had been done to him, and stumbles back into the ship." That sounds infinitely more sinister than David doing the equivalent of putting a roofie in his drink.
"In my draft, he returns to his cabin, is embraced by Shaw, who is delighted to see him having feared that he had died, and the two of them make love," he continued. "And it's while they're making love that he bursts and dies. So that lovemaking sequence echoed my original lovemaking sequence where he explodes! It was messy." But that's not all. David's contempt for humans goes even further, and Spaihts reveals how he originally envisioned the plot turns that led to Shaw cutting into her own uterus.
"So at one point Shaw goes to stop him and David ties her up and deliberately exposes her to a facehugger. He caresses an egg open and out comes a facehugger," he said, noting that because David is a robot, it doesn't draw the interest of the facehugger. "...But then he exposes it to her and it goes for her like a shot. He toys with her for a bit and then lets it take her. That, in my draft, was how Shaw was implanted with the parasite that she had to remove with the medpod sequence."