Situational awareness should be the hallmark of your decisions.
What he said.
Rules like "the belayer is always anchored to the ground" leads to goofy decisions like the belayer on Laurel tied off to and standing by either the Rhododendron tree, or, more comically, a tree on the other side of the carriage road. Alas, I've seen both more than just a few times. In one of the latter occurrences, the leader also put a full length runner on the first pin. This was one of those times when Ravitch, Liff and I quietly went to the rescue box, brought the stokes litter over, and placed it near the base of the climb.