The not swearing was a combination of being lost for words and the start of the focus part. The gloves came off for the first attempt, the helmet, glasses and earplugs were a combination of playing for time whilst gathering thoughts, and a realisation that it might take a while so I may as well get comfortable. When it happens again, I'll try to stick something into the ground by the tyres to stop the bike sliding away from me mid-grunt.
How did it happen?
Still not entirely sure. I was standing by the bike reversing it when it happened. Either one or both tyres may have slid out while the bike was leaned, or maybe my boots slid.
One left handguard cracked, and dented pride. Very impressed with the camera's 'horizon lock' feature working perfectly at 90 degrees to capture the man and the moment.