Some years back, I was alone on duty, working APP+TWR, early in the morning when I felt a personal physical emergency. Still an hour to go before colleagues arrive.
I changed my control position, turned the radio level up and as the mike's wire was still a bit too short to reach the outside, I eased myself through the alleyway's door.
Can't say if there was someone 30 m below. Don't know if pilots knew about my situation.
I imagine I was not the first nor the last.
This kind of things can happen when there's only one crew on board.