Looking at that video, my guess is the school official (AD ?) initiated the sec guard response.
IOW, probably school official asks person to wear mask, gets blown off, then gets the sec guard to remove the person. I don't think the sec guard would act unless asked to do so by an official.
Saying that because school official appears to be doing jack-shit to defuse the altercation as the sec guard is grappling with the girl/woman.
Why not just send the woman a citation after the fact, since if it's a student's family they would no the person's identity an address?
Very poor decision here. A no winners decision. Sec guard & school district gets their ass sued off, woman has to live with a viral video of her being grappled with.