Wow! Going solo at 10-15h is scary enough but imagine this with the added time pressure to save someone's life. Truly impressive feat!
Reminds me of this story that happened a few years back in Scotland:
https://www.express.co.uk/life-style...ll-unconscious
TL;DR: The pilot sadly died at the controls and his sole passenger and friend, a 70-something year old chap with no prior flying experience was helped by ATC and an instructor over the radio to land at a nearby airport. End of daylight was also approaching fast.