I'm sorry but these rules have no meaning to me as to what the OP's question was. These explain about what happens to a runner or what they are awarded should a fielder do a,b,c,d, or e.
I do not see how they reflect what happens to an injured runner.
Now this is LL
I did see from 3rd BU a kid earned a 4 ball walk upon his trot up to 1st he stepped in a soft spot and wrenched his ankle. He collapsed right there and went into tears. No other runners so. Being its LL HP calls time for injury. Kid is replaced by a "special pinch runner" (LL rule) who goes to 1st base and the injured child hobbled off on his own power after 3 min or so.
So MLB
same situation I imagine time would be called if no one was on, and the injured player would be assisted off the field and a substitute would be announced and enter.
Home Run same thing although Gibson managed to man up and hobble around the base path. To be blunt I don't think any MLB player short of breaking their leg would not trot out a home run.