You could have easily made it back to the Home Point by simply stopping the descent with full left stick and flying on back. Until the battery reaches less than 3.0V on a single cell, it will allow you to fight the descent, even well past 0% remaining battery. On the P4, you still have about a minute of flight time left, even after reaching 0% remaining battery.
You had about 3 minutes of flight time left when it started Autoland and you were 2421m or 1.5 miles away. At 30mph, you would have required 3 minutes before a truly forced descent. Just keep walking towards the drone during the last 10% and be under it by the time it reaches the ground!
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