After he checked the water for any dangers by throwing random rocks in it and some grass to know how fast the water was.
The young man finally dipped his whole feet inside the river making his trousers wet yet he didn't care at all.
After a bit of time, a young man was inside the river buck naked taking his dear time to wash himself off.
All the fishes that seemed dangerous went forward toward the current making Lucas think that they were scared of him.
He wasn't able to get the description of the many fishes but he didn't care, the shelter may have had a water source but seeing such a freshwater body felt relieving and exciting in a whole different way.
The whole river was empty and only clear, clean, and fresh water flowed continuously.
Lucas swam easily with his strength and after taking all the time he could give to the river, he finally got out and wore his clothes making them wet too.