What happened to Nya and Salva in A Long Walk to Water by Linda Sue Park in Chapter Two?

Nya:

Southern Sudan, 2008. As she walks to the pond, Nya steps on one of the large, spiky thorns that litter the path. She stops, sits down, and uses another thorn to dig it out, trying to ignore the pain.

Salva:

Salva runs away from the fighting, and he soon arrives at a rebel camp. The soldiers divide them into two groups: men and teenage boys in one group, women and children in the other. Salva is not certain which group he belongs in and starts towards the men, but a rebel soldier stops him and sends him to the group with the women and children, telling him not to be in such a hurry to be a man. The next morning the rebels leave the camp, forcing the men they have separated from the others to carry their supplies. Salva and the women and children from Loun-Ariik walk in the opposite direction, because they know that wherever the rebels are going there is sure to be fighting. That night they stay in an old barn and the next morning when he wakes up, Salva finds that he is alone.