'I thought he was playing the part of an active shooter for our drill'
WEAPONS USED.
>> Reporter: WE HAVE A PRE-
PRODUCED STORY FOR YOU IN JUST
A MOMENT BUT I WANT TO START
WITH AN INTERVIEW WITH NED
CARLSTROM.
WE BUMPED INTO YOU LITERALLY
TWO MINUTES AGO.
YOU WERE TELLING ME WITH YOUR
INTERACTIONS WITH THE SUSPECT
IN THIS CRAZY SHOOTING.
WANT ME TO YESTERDAY.
YOU WERE AT WORK.
YOU HAVE WORKED HERE 26 YEARS?
>> YES.
>> Reporter: WHAT ME TO
YESTERDAY.
>> WE HEARD A COUPLE OF PEOPLE
SCREAMING THERE WAS A SHOOTER
IN THE BUILDING.
IT DID NOT SOUND REAL.
THE SHOTS WERE REAL MUFFLED.
WE THOUGHT IT WAS A DRILL.
WE THOUGHT WE WERE HAVING A
DRILL.
WE GOT UP AND STARTED WALKING
OUT OF THE BUILDING.
WHEN WE DID, WE PASSED BY A
GENTLEMAN THAT WAS CARRYING A
GUN IN HIS HAND, BUT IT LOOKED
SO THEATRICAL BECAUSE OF THE
EXTENDED MAGAZINE AND THE
SUPPRESSOR THAT WAS ON THE END
OF IT.
HE NEVER LOOKED AT ME, HE
GLANCED AT ME, BUT HE NEVER
RAISED A GUN AT ME TO SHOOT ME.
WE FOUND OUT LATER HE WAS THE
ACTUAL SHOOTER.
HE WAS A COWORKER.
I KNEW HIM.
I THOUGHT HE WAS PLAYING THE
PART OF AN ACTIVE SHOOTER FOR
OUR DRILL.
>> IT WAS A REAL SITUATION, A
REAL GUN.
>> Reporter: YOU KNOW HIM, YOU
HAVE TALKED TO HIM, YOU HAVE
HAD 24 HOURS TO PROCESS THIS.
I KNOW THAT IS NOT A LOT OF
TIME, BUT DID THIS COMPLETELY
SHOCK YOU THAT THIS GUY YOU
TALKED TO AT WORK IS ALLEGEDLY
RESPONSIBLE FOR ALL OF THESE
KILLINGS?
>> YES.
I NEVER WOULD HAVE THOUGHT IT
IN MY WHOLE LIFE.
KNOWING HIM FOR THE TIME I HAVE
KNOWN HIM, I JUST CAN'T PICTURE
HIM.
ONE, I CAN'T PICTURE HIM WITH A
GUN AND TWO, I CAN'T PICTURE
HIM DOING HE ACTS LIKE THIS.
>> Reporter: WHY DO YOU THINK
HE DID NOT SHOOT YOU?
>> THE ONLY THING I CAN THINK,
MAYBE HE VIEWED ME AS FRIENDLY
BECAUSE WE HAVE HAD
CONVERSATIONS AS WE WALKED INTO