Details aren't clear yet, he may have been concealed carrying (legally?) and during the struggle agents saw the weapon in his waist, one alerted the other agents, gun! and then a moment after he was disarmed by one agent, another agent opened fire due to the ongoing struggle and not knowing the suspect had by that time been disarmed, so expect things to get more tense.
The Daily Wire has a new anti-Islam, Zionist propaganda film called Run Hide Fight: Infidels, about Muslim terrorists who take over a college campus and the kids fight back, but I don't think they intended this scene to be hilarious and portray the Muslims in a positive light haha.