User blog comment:Razza22/Gordo The Boar question/@comment-1839041-20100830004732

Actually he can go in the water, and you automatically collect his parts if you walk towards his dead body in the river. This happened to me while I fought him. He does not drown, you still must shoot him, but it is still possible to complete the challenge. He charged me, missed, and continued into the shallow river at which point I killed him, waded over and (thankfully) got his meat, pelt, etc. to complete the master hunter challenges.