By the time you've turned in a full rotation, you've seen that there are two gaps in the wall in front of you. The first is lined by what you initially take for normal bushes. When you step closer, however, you see the thorns, sharp and evil looking.
At the sound of your shoe pressing down on dead leaves in your path, the bushes suddenly shift, the thorns moving in towards the space between them.
They can hear you, you realize.
You turn to look at your other option. Through the second gap in the wall, a thick mist hangs over what looks for all the world like a swamp that stretches out for miles on either side of you. You take a moment to try to work out the geography of the situation and promptly give up.
The swamp seems to be at its narrowest at the point you're standing at. If someone was athletic enough and had a good run-up, they might be able to clear it.
Might.
You take a step back, considering your options.