Fun fact: there ARE alarms made to also work for people that are deaf! The simply have flashing lights in addition of the sound. Also, ideally, drills would be used to figure out any big flaw in the place‘s precedures… and we saw a BUNCH of them here. :X
Here it’s clearly used to make the boy look good, but IRL I would be FUMING and complaining to the staff to fix their shit, no question asked!