"I thought Nereo was very good. I was just disgusted with the organisation. They just hold the competition when myself and the Swedish boy were ready to go in.
"With dressage, we're given a time, we work it to the minute. It may sound a bit pathetic, but we do, we try and judge our buildup to the minute.
"You're prepping the horse up, getting stronger and stronger, more energy, and then suddenly you're told to stop for 10 minutes. What do you do? Do you let the horse down so he thinks he's finished work, or do you carry on pressurising him for 10 more minutes, when you know you then can't have him right in the arena? He wasn't sure whether it was just another training session or not.
"I question the decision. Why didn't they stop the British rider? When you're soaked through for 10 minutes, all you do is get slippery in your saddle."
British rider Katrina Cook copped the worst of the weather but produced a solid round of 42 penalty points. It was after her ride that the grand jury deemed it too dangerous to continue.
The delay was even more difficult on Swedish rider Niklas Lindback, who had entered the arena only to be told to return to the holding area. He was in tears after picking up a score of 45.20.
Nicholson didn't think the situation was terminal for him but he will become vitally important in the team's event where the top three riders from each country count. It wasn't exactly what he had in mind at the Olympics.