That was my take -
First guy is dead because he was slow to draw.
Second guy was dead because he was too slow to do anything.
Security guard was slow too, but had distance and made his one shot count.
First guy drawing demonstrated how long it takes to do so from concealed carry. Second guy was too close to the shooter to react and appeared to be unarmed. The security guard shot when the opportunity allowed it. I would not consider him "slow" simply because he didn't have a clear shot at the target, I think he did absolutely the best anyone could.