Surely it was not an intentional edit that ends this clip in mid sentence .... particularly such an important statement that contrast the hazard of pursuing sudden enlightenment exclusively with the previous statement on the hazard of only relying on gradual enlightenment. That being said, I offer the following observations.
As I understand the issue, the danger of the repeated pursuit of the "ultimate" sudden enlightenment experience that leaves one in a permanent and stable exalted state is two fold. First, the pursuit is illusory, a misrepresentation of enlightenment. Second, the drive to repeat or surpass previous spiritual experiences can easily become addictive behavior.
I would also expand on the danger of resting in repose waiting for gradual enlightenment. Here it is easy to mistake the peacefulness in sitting as evidence of progress. Then it is tempting to place to much emphasis on formal sitting and it becomes an activity asbtracted or separated from daily life.
It is my observation that gradual and sudden enlightenment are not separate at all, simply two sides of the same coin. Spiritual experiences and insights serve to loosen or perforate the personality structure and its supporting content. This allows attentiveness in daily life to dump useless or harmful content more easily and transform the structure more rapidly (but still a process that occurs over time).
Jerry