Linius saw the small interaction and he knew that his soldiers were worried. Like him, they also had their families so it was a human's nature to worry for someone who looked weak and ordinary. It was ingrained in their blood to protect those who couldn't defend themselves.
"Don't worry my brother isn't as fragile as he looks. He is actually strong and even though he grew up in luxury, he is also used to a simple life. He'll be fine." Linius spoke from behind them with his gaze on the master.
The soldiers saw that he was looking at his brother's direction and believed his words. They did not hear the young man complain throughout the journey and he was not picky with what he ate which was actually a relief. If it were the child of other aristocratic families, they would have already heard several complaints. Luckily the general's brother was not like that.