@rkkn
I was reading his hesitation as reflecting our reality and its values.
One has to have permission prior to using experimental procedures.
One has to have permission to do damn near anything to avoid lawsuit for malpractice.
If a life is saved as a result of treatment, but there's a side effect of the treatment that endures... folks will prosecute concerning that side effect totally ignoring that the individual would have died without said treatment.
He has memories of an advanced civilization; this stuff is part and partial of advanced civilizations.
Since he isn't living in an advanced civilization ... mob justice has always been a thing.
Since they don't know of an effective treatment, those who survive, survive.
They are familiar with what changes might be there with those who survive.
If he treats her and she survives, what proof is there that it was due to his action unless the odds of survival are that bad?
If the survival odds are that good, then if a side effect kicks in some would be sure to argue that she'd have survived and that his action caused her to be worse than if he'd left well enough alone.
All of which is well and good, but my take based upon what we've been shown in-story is that there was ample justification for believing she wouldn't survive without his treatment.
Definitely that he didn't believe she would survive without his treatment, which is why I considered his hesitation the stupidest thing ever.
Yes, it's nice that he understands all of these ethical considerations, but if he believes she will die without proper treatment... at least start moving toward her house while mulling over all of this stuff.
Or be shown packing the required materials for transport, something other than standing around stroking his chin while pondering ethics.