The other day, Holly and I had our boat out in a pea-soup thick fog. We couldn’t see an inch past the bow. As we “discussed” the situation, we kept looking back at our wake — the only thing visible outside the boat. From the seemingly straight lines of the wake, we felt confident we were going dead ahead. Of course, it turned out we were going around in circles. That little adventure reminds me of one of the biggest problems in mediation: Lawyers and litigants so focused on something from the past they can only look …