Very likely one was doing things right, and one wasn’t...and they both die.
Based on how they died, the guy by the ocean got too close to the cliffs AND the guy by the cliffs. That explains how they hit each other AND then the cliffs.
Just as likely is that they both felt safe with the margins since they were 'pros', but mother nature decided to throw in something totally unpredictable.
Actually, this kind of reminds me of the crashes between US Navy ships and Supertankers.