After that, the last 2.5 hours are the final attempt to complete the challenge.
The bear is fairly relentless, which means you need to have adequate means to scare him off throughout the challenge. This can be quite exhausting on your resource supplies, especially since you can't throw torches any more which was a much more effective means of scaring off wild animals. In this 4 minute clip, the bear chases me, only being kept at bay because of a torch in hand.
These are the final sixteen minutes of the challenge mode. While trying to avoid the aggression of a wolf on the train tracks, I take the more narrow route in Mystery Lake planning to go up and over. I foolishly decide to try scavenging in one area that leads me into a dead-end with the bear trapping me. In escaping from this moment, I use two of my last three shells. This means I only have one shell left to get from mystery lake to the hunter's lodge.
I double back over a ridge but while climbing the ridge I sprain my wrist. This means I can't even use the one shell I do have! While the bear begins to come after me once more, I am forced to practically jump off a cliff, then making a fire and resting on a ledge over the derailment at the end of the railroad tracks.
From here I can wield my flare gun once more as I go into the snow to the hunter's lodge. A storm sets in and darkness encloses. In the final moments, I see the bear one last time.