The point is he was walking.
Have you ever seen a medivac’d person allowed to ambulate THEMSELVES anywhere into a hospital?
If you could transfer him on a gurney with ZERO risk of stepping on a sharp rock and puncturing the containment suit why would you allow him to walk?
How would you even get someone in that get up onto a gurney?
Think about it: if he can walk, and is well enough to travel that very long distance, he’s better than one would have expected. I pray with all my heart that he recovers fully.