Hmmm, well stuck shot, leave skid mark, firm green....
It is possible to leave a slight dimple in a green if one hits a towering wedge-9I into greens at WH, when she plays firm. Where is that on the continuum of firm?
Seriously, the surrounds measure of firmness and HOC are also an interesting related factor to me. I'd love to see KC when Dan has it just the way he wants it.