The 2nd dot of the Parkour Merit says
Cat Leap (••): Your character falls with outstanding grace. When using a Dexterity + Athletics roll to mitigate damage from falling, your character gains one automatic success. Additionally, add your Parkour rating to the threshold of damage that can be removed through this roll. Parkour will not mitigate damage from a terminal velocity fall.
But the section on falling damage (p97) doesn't say anything about a "threshold of damage that can be removed":
If the character has the opportunity to slow his fall, for example by grabbing an awning, or to soften it, such as by twisting to land on soil rather than concrete, his player may make a Dexterity + Athletics roll, with each success on the roll reducing the damage the character takes by one point. It’s typically not possible to slow or soften a fall at terminal velocity.
So what is it referring to?