Allow me to point out the obvious here, but Acadia didn't see what started this incident.

Given that Acadia didn't, we don't know all the facts. For all we know the store security may very well have been protecting everyone from a crazed woman who'd brandished some sort of weapon in the store.

Wich would mean, in such a situation that the force was not "excessive".

 

"The Blood is the life!"