You are up for the challenge, no matter the size of the beast that comes through the tunnel.
Shoot. It's a Troll.
You fight for your life, using every tool at your disposal: The torches, the oil, and the blazes they produce. Lucky for you the Troll is a fool and instantly loses control of the situation once fire spreads.
It is more a game of hide-and-seek than a fight, and The Troll does most of the damage to itself. Eventually, once the beast has soaked itself with oil, all you must do is toss a torch and run. Miraculously you escape the cave with your life.
The daylight is warm and relaxing on your face.
I need to find some pants.
Suddenly, storm clouds gather, as they often do in the mountains. It doesn't look good. Almost immediately a downpour begins, and lightning fills the skies. You're standing on a rock in the open...
ZAP!
You're dead.