Congratulations on applying and augmenting realism in your dreams!!!
You wanted to make it more realistic, and your mind gave what you desire. You set the constraint that when you die, you wake up, and although that may be a good way if you just want a "safe word" or exit plan, it made the dream too realistic, especially for the part where you were injured and felt you were slowing down because of it. I would presume that if you're going for realism, anything that has serious injury would simulate the exhaustion of trying to move on with blood dripping down or the pain becoming more excruciating with every step.
It worked, and you were really surprised on the outcome, and I guess you have the potential to do more with accessing your subconscious' state of suggestibility to produce dreams of similar realism, but with other conditions (like not focusing too much that if you die in your dreams, you'll wake up). You could say that if you die in your dreams, you won't wake up, you can just say that if you want to wake up, you'll tell yourself you'll want to wake up. The reason being is that if you can pull off that kind of realism, you can literally set any condition for your dreaming endeavors.
Again, congratulations! Thanks for posting your experience, it just portrays how near-perfect our minds can create models of realities with certain conditions. Who knows, maybe you could even experience what it may be like to have something as far-fetched as the anti-life equation or something.

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