You can’t just fall off a balcony without behaving stupidly in some way. They are designed to prevent you falling off them if you are simply stood on the balcony. Even if you were stood against the barrier & fainted, your body would crumple downwards. Balconies are high enough that they would block you from falling backwards over it!
Obviously, if you are sitting on the edge or leaning over in a stupid way, then over you go. If he was a high as it appeared, I imagine he would do something daft. The lighter & mobile would be in his pockets, the bottle of whiskey .. I presume he was holding & drinking