Yeah, reduce the paces to fit.
We once had a CWO come back from staffing JNCO like she’d joined the Reich. She was trying to teach the unit this.
The marker she chose was a clever, lazy cadet. He could see what she could not. The parade square would not fit 15 paces, a halt and end with him two paces in front of her, who herself was two paces from the building. You need 21 paces from wall to wall, (I measured later, it was 15 wall to wall.)
So the marker marched forwards, and he did the shortest paces I have ever seen. 15 teeny paces and he halted two paces away from the CWO. Perfect.
She calls on Parade, and the squad of unobservant cadets march forward with confidence. Until they realised that at about 10 paces in, they had to fit five paces and a halt into about the space of one. So the last bit was basically them all stamping on the spot repeatedly to make up the numbers.
The CWO was apoplectic. It looked awful, so she made them do it over and over. (She also hadn’t clocked marker’s teeny stride)
When I pointed out to her she was asking the literal impossible, she told me that she was taught 15 paces at the weekend, so that was what she was going to do and carries on.
It would have been funny, had the cadets not been getting shouted at. But the AWO just told me to butt out when I asked him to intervene, because, at the time I was a CI, and it was none of my business.