If you call that common sense, you're in big trouble.
How it really happens is:
PRev and Nucc are hiking when they turn a corner and come face to face with a big mountain lion. The lion looks at them and then crouches, about to charge.
Without hesitation, Nucc whips off his backback, pulls out a pair of running shoes, and sits down to replace his hiking boots with the running shoes.
PRev, still wearing his hiking boots runs off.
The lion eats Nucc while he is trying to change his shoes ..