From role playing perspective. What you know is it is a cave. The guy running out of the cave thought he saw a bear. His "friend" did not make it out. As a savvy adventurer I wonder, is it one tired old bear, is it a sow with her cubs, is it a sow with two yearling cubs who haven't moved out yet. As a heavy role player it never occurred to me to go into a cave alone and this without any pre-exposure to how tough the bear was. Hey I just got out of a cave, need to get to town and get myself oriented and equipped and, maybe, find some help. Maybe if you are some city dwelling scholar type rushing in blindly would make sense, but if you have any wilderness smarts you definitely would not.