Capture The Flag

You decide, why not? Go through both of them. So you start with the brown one. As soon as the door opens a tiny bit, an overwhelming force pushes the door open and pulls you in. Every color that will ever exist flashes in your face in the fraction of a second and it all goes black..

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You feel something wet and lukewarm on the back of your head. You get up and look down, and the snow by your head is soaked red with blood. Your pain is gone though, yet oddly.

After climbing down to the bottom (since no entrance is visible on top) you find yourself with two possible entrances to their base.

A: Knock on the gate. Mayyybe someone will let you in?
B: Go into the door on the left.