What mechanic are you thinking of?
Well right off the top of my head without the book in front of me, when a character takes damage greater than twice their wound threshold, they need to roll 1d100 under the sum of their somatic attribute and their coordination attribute.
When a character is shot at, he can attempt to hide behind cover, avoid fire, and otherwise dodge the attack by rolling a 1d100 underneath half of that character's fray skill.
Margin of Failure/Success can get a little foggy when the roll has a lot of situational modifiers.
Nothing mind shattering, it's just that remembering when to divide, when to multiply, and when to subtract can get a little difficult. I just think it requires a lot of referencing the book.
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