Alwin might indeed need to learn that lesson by experience since he still wants to keep pushing himself even after what happened today.
It was admirable to see him so motivated and dedicated to his tasks but it was also worrisome.
Still, it was better to let him do as he pleases until he learns a lesson himself than make him feel like he was useless baggage for not doing more when he could.
However, Alwin needed to learn to prioritize his own safety.
It was true that he could help as long as he was able but not to the point of putting himself in danger consecutively when he was already in bad condition.
Thus, Raymond decided it was best to let Alwin learn it for himself.
Arabella did not interfere either and let it be.
After all, no matter what they said, Alwin would not truly grasp it to heart until he experienced it himself and finally understood why his elders had to scold him for being reckless.