As per text above eq. 32, it is mentioned that ,"The general rule is to choose the Zener or TVS diode rating to be 1.2 times the reflected voltage:" However the equation below uses 
As per "Mitigating Procedure on Voltage Spike of Switching Node from Flyback Converter" application note, reduced factor improves the performance.
So what is the significance of factor "2" in equation 32.
