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Garrak was confused by Thag's odd behavior, even after the explanation, but he guessed that he would use the stones to throw it at any potential enemy and notified him that if it were to come to a fight, Thag would need to run and warn the rest of the members of the tribe about the dangers.

After Thag had gathered enough stones, he tells Thag that they should move before the sun starts to set, as at night they could be easily ambushed by a predator or other hostile people

And with that, Garrak begins to move out, hopefully with Thag following close behind him.