via KTLA:

SAN BERNARDINO, Calif. -- (KTLA) -- People who were inside the Inland Regional Center during Wednesday’s attack put their lives in the hands of an officer who led them to safety, a video shows.

“If you’re not cool, I’m not walking them,” the officer shouts to an unseen colleague as the people stand anxiously waiting.

When satisfied the way is clear, the officer tells the people to keep their hands “where I can see them,” and head for a deputy, where they’ll turn left.

FULL STORY: 'I'll take a bullet before you do': Video shows San Bernardino evacuation - KTLA