The metal detectors were apparently being disassembled--that had been reported but the video completely allows that to be the case.
Then the three all, in unison, bend suddenly away from Allen as they raise their hands in what looks defensive. You know, the sort of response that a really loud possibly threatening noise might provoke.
Another guy on the other side of the checkpoint at the exact same time and for some completely inexplicable reason suddenly bends forward, clutching his left side; then as he reaches for his gun as Allen runs by, his right hand going for his gun, his left hand still clutches at the part of his chest that was facing Allen. Mysterious, that bit of play acting.
Gee, I wonder what made the three guards lurch backwards and raise their hands defensively just as the other agent bends over and clutches at his chest? Maybe that's standard training protocol--when a person runs by, act like you've been shot as others perform some sort of choreographed routine?
Note that as Allen approached that particular agent at the checkpoint he was carrying something fairly long and fairly thin that was pointing fairly horizontally and directed a bit to his left--weirdly, directly at the agent in the suit! But as the agent was busily bending over, and Allen ran by, he repositioned the long thin object to pointing straight ahead.
(edit)
On reading the text from the news reader, I don't see who she's talking about, to be honest. Maybe stills would show more.