He-Man's story involved Prince Adam using the power of Grayskull to become the mighty He-Man and engage in epic battles. It was filled with adventure, magic, and the struggle to keep Eternia safe from the clutches of Skeletor and his evil plans.
If a man thinks he's in prison when he isn't, it could be due to a hallucination, a false memory, or someone deliberately tricking him into thinking so. This could lead to all sorts of problems for him in terms of his mental state and how he interacts with the world around him.
It's very likely he is not alive. Jumping from 9 stories is a very long fall and the impact would be extremely severe. However, there could be some very rare cases where he might survive if he landed on something that could cushion the fall, like a large pile of soft materials. But generally speaking, the odds are against survival.
The 'man in full story' could be anyone. Without more context, it's difficult to determine exactly who this man is. It could be a character from a book, a real - life person someone is writing about, or even a fictional creation for a specific narrative.
We really don't know. Maybe he was alone and just had some sort of accident, like slipping near the edge of a balcony on a high - rise building. Or perhaps he was with someone who could have tried to stop him from falling, but failed. Without more details, it's impossible to say for certain whether he was alone or not.