BMS stunt rider Danny Macaskill take death-defying ride to the ridge

Just to clarify, I think you meant BMX. This isn't BMX, it's Mountain Bike Trials, MBT, or simply Trials.
The two are completely different. Different bike, different ride.

At around 5:00 that was a complete mindfuck for me

ALL. OF. MY. NOPE.

My palms got really sweaty