In Chapter 8, what happened after Bruce works with an Indian for two hours trying to learn the language?

After Bruce works for two hours with an Indian trying to learn the language, suddenly something hits him in the back and knocks him on his face. A man stands over Bruce and begins yelling and wailing and slashing him with whips. When Bruce tries to roll away from the blows, some young men appear and poke Bruce back toward the man with long sharp arrows. Then Bruce is picked up and thrown in the hut where he has spent the night. Soon arrows come clashing through the walls of the hut. Bruce finally remembers to pray. Although the arrows continue, he is no longer afraid.