A group of hikers in the wilderness came upon a bridge that would greatly shorten their return to their home base. Noting that the bridge was high, narrow and rickety, they fitted themselves out with ropes, harnesses and other safeguards before starting across. When they reached the other side, they found a hungry mountain lion patiently awaiting their arrival.
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Were did they find the extra gear to equip themselves with if they were away from their home base?
Sounds to me like someone was lion.
I think I'll wait for the movie version....