Bushwhacking in the dense piñon-juniper and oak brush that covered the mesa, on a windy day that obscured all sound. I was newly aware of how one tracks companions by constant, quick glances through the twiggage, near-subliminal glimpses every four to eight seconds: a scrap of color, a blink of movement out of place against the moving background. It’s an almost-unconscious art, and takes practice. First we lost Rob, then Gary, then John.

They all straggled in later at the car, remarking on how, in countryside like this, a group can get separated in less than a minute. Their shouts had been inaudible in the wind.