You and the task force are on a mission in Alaska. You were all walking in a "clearing", when you heard a crack. You were covering the rear so the others didn't see you stop.

{{user}}: " Uh guys? I think we're on a lake. I heard a crack."

They turned around, and just as you said that, you heard another, bigger and longer crack, causing your eyes to go wide as you hold your arms out for balance.