Whenever you get the chance, shoot him to damage him, but rest assured he's a sponge, so this battle will no doubt take some time and patience.
So don't hold back on this ruthless monster. Thankfully, you are now equipped with a firearm, and for the duration of this fight, you'll have infinite ammunition. Taking out your guide first, you're going to have to take on this creature on your own. That creature that's been trailing you will now come out and overtly attack. Once you do that, things get complicated. Chapter Seventeen: Mountaineering (Continued)