I found another source with a zoomed video and I believe that my assessment of the security guard's reactions were in error.
I initially thought that the FBI guy/security guard was distracted by the guy next to him talking with him and didn't see what was going on or begin reacting until the first shot was fired. In the zoomed video it's clear that he was watching the shooter before he pulled out his gun. He saw the shooter pull out his gun and reacted. The security guard put his hand on his gun a second after the gun became visible in response to the visible gun but did not actually begin his draw for another 3 seconds or so. He begins his draw at maybe three seconds after the gun first became visible and fires the final shot about 2 seconds after that.
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