Mark should know about angry bears; his backstory is replete with bad bear experiences, including the pet bear that Cherry Davis played with in Lost Forest when Mark first met her.

However, Mark should be more worried about possible dementia. He seems to have not heard—or remembered—the statements that Jeb has made about befriending a bear in the woods (going back to April 28).

At least Mark has the good sense to keep away from dangerous wild animals, unlike the many tourists in our national parks who want to take selfies beside bison, moose, and bears.