My point was that one should rush into constrictors too vigorously at first, at least not until you've gotten your penis accustomed to the pressures that you can easily apply by clamping. That's all...
This is an easy concept for you to grasp and may be obvious because of your experience but for the beginner, it may not be. I obviously fall in this category. I usually jelq at ~90 erection and pretty hard, i also started pumping again. Because of this, I thought that i could jump right into constrictors with little risk of injury. I was wrong. Just trying to look out for the next guy, that's all.