This reminds me of an audit I did of an over-height single staircase hotel in the finest capital city in the UK.
An alternative MOE was via a steel balcony at 4th floor level which took escapees to outside of next door's sash bathroom window (to a flat). The sash window was mounted in a hinged frame which swung horizontally out over the balcony & was secured closed with a maglock connected to the Hotels AFD. The sash window would slide vertically as normal during business as usual.
However, when the fire alarm activated in the Hotel, the window maglock released and simultaneously a buzzer would sound in the HMO bathroom to warn anyone in there to cover up!! With the maglock released, those escaping from the Hotel could open the entire sash window on its hinged frame and climb into the bathroom, through the HMO and out to the street. A green BGU door override was fitted outside the flat's window.
It remains the most bizarre MOE I have seen. I didn't want to allow it, but had no grounds not to. I even went back in the evening to discuss the matter with the tenant of the flat as I was sure they wouldn't know about this arrangement. After all, with the door override outside her window, any occupant from this seedy establishment could gain entry at any time. But no, she was happy to have 30 punters from a dodgy Hotel climbing thru her window wit 30 seconds notice!! As far as I know, it's still there!!