I once accompanied my LOR to the hospital on Shabbos when he thought he was dying (ended up being dehydration from the flu). After IVs and the such, he was well enough to go home around 5pm. Being summer, Shabbos ended a few hours later, and home was 10+ miles away. We understood that we could get a ride to the hospital for pikuach nefesh, but not home when he was well again.
In Hashem’s great mercy, he sent us an off-the-derech nurse at the end of the day who suggested to us (without asking) to do another round of IV’s to ensure (his health) we were not kicked out of the hospital before sunset. We made havdalah a few hours later, then calld for a ride.