The Diwali sale crush and the chained fire exit
It is 18:40 on the second day of a three-day Diwali sale in a three-floor mall sanctioned for 1,500 persons. Door counters show 2,450 entries and 900 exits in the last hour. A celebrity appearance is scheduled at 19:00 on a stage in the ground-floor atrium, and crowds are pressing towards it from both escalators. You find that the north-side ground-floor fire exit has been chained shut by a kiosk operator because customers were leaving without paying, and a stack of flattened cardboard cartons is piled in front of it. On the first-floor escalator landing a shopper has fainted, and people are stopping to look, causing a backflow up the escalator. Twenty-two guards are on duty; fourteen are on the ground floor. The mall's public address system is working.
1. Rank your interventions for the next fifteen minutes, and justify the ranking.
Read the worked answer
Rank by consequence, not by urgency: a thing that can kill hundreds if it goes wrong outranks a thing that is merely happening now.
- Clear and unchain the north fire exit. A blocked exit at a density of roughly two and a half times the sanctioned capacity is the one failure that turns a crowding incident into a mass-casualty event. Bolt-cutter or key, cartons removed immediately, and a guard posted there or a one-way alarm fitted.
- Stop entry. Close the doors and hold arrivals outside, counting exits against entries until the operative figure is back near capacity. The building is already over its sanctioned load, and every further entry compounds the crush at the atrium.
- Break up the escalator backflow. Stop the escalator, send two guards to take the fainted shopper into a cleared circle of about three metres, and keep people moving past rather than stopping to watch. Stoppage on an escalator landing is how a crush starts, because people behind cannot see the reason for the halt.
- Control or postpone the celebrity appearance. This is the demand that will pull the whole crowd towards one point at 19:00.
- Inform the manager, the fire officer and the police, and log every step with times.
Note the sequencing logic: I did not begin by attending the casualty, because she was already down but the exit was still blocked for everyone.
2. The kiosk operator argues he is protecting stock from theft. How do you deal with him and what is the correct position of law and policy?
Read the worked answer
The argument is not unreasonable in motive but it is legally untenable, and the guard cannot accept it.
Legal position: a fire exit is a life-safety provision required by the National Building Code 2016 (Part 4, Fire and Life Safety) and by the conditions of the mall's fire no-objection certificate; exits must be kept unobstructed and openable from the inside at all times. Chaining it is a violation that can attract action against the building owner, not only the kiosk operator, and condition of stock is never a defence to it.
Practical position: his real problem is shrinkage through an unmanned exit. Acknowledge that and offer the legitimate alternatives - a one-way exit door with an alarm, a posted guard, or a camera covering the door - but the chain comes off first and the discussion happens after.
Handling: be brief, do not debate in front of the crowd, and do not get drawn into an argument about whose permission it is. Say what is being done and why in one sentence, remove the obstruction, and immediately report it to the manager in writing with the time it was found and cleared. If the operator resists physically, escalate to the manager rather than to force. The log entry protects the guard, because it is the kiosk operator and the mall who carry the liability for a chained exit, and the guard who discovered and cleared it should be on record.
3. Give the specific crowd measures you would apply for the fainted shopper and the 19:00 event, with numbers and flow logic.
Read the worked answer
Crowd injury is a function of density and counter-flow, so both measures attack those.
The fainted shopper. Stop the escalator so no one is carried into the crowd above her. Clear a circle of about three metres, kneel her head to the side if she is breathing, loosen clothing, do not sit her up quickly or give water while she is drowsy; call the on-site first aider and 108 if she does not revive within a minute or two. Send two guards to keep a moving lane past the circle rather than a wall of onlookers, and use a single PA message - 'a customer has fainted, please keep moving, medical help is on the way' - so the crowd stops speculating.
The 19:00 event. A crowd above about four persons per square metre loses individual control and the pressure becomes involuntary; the target for the atrium and both escalator landings is two to three per square metre, with a hard stop on entry to the atrium once that is reached. Make the flow one-directional: entry from the east escalator, exit by the west, barriers or guard lines to prevent counter-flow at the landings. Keep a clear four-metre emergency lane to the north exit. Use the PA repeatedly before 19:00 to announce that the stage area is full and that the appearance will be relayed on screens, and hold or shorten the appearance if density is not controlled. Guard command must have a pre-agreed trigger: if the fire alarm sounds while that crowd is in the atrium, the evacuation and the crush will collide, which is why the exit clearance in task one comes before the event, not after.