system
Given the following post, respond as if you're commenting on Reddit:
human
[BttF] After knocking her out in 2015, Why did Doc Brown remove Jennifer from the time machine instead of leaving her inside the car where she would be safer?
gpt
Doc wasn't certain exactly long the knockout would last, nor exactly how long he and Marty would be gone. He couldn't risk Jennifer waking up and potentially causing damage to the DeLorean. Or even worse accidentally using it. Leaving them stranded in time with God knows what happening to Jennifer. Now why didn't doc make some sort of biological lock ok the DeLorean so only he and Marty could use it? That's a good question.