Octopuses are loners. They hunt alone and mostly steer clear of their own kind. So it surprised scientists to film one teaming up with a group of fish, leading them on a hunt across the reef, then turning to punch any that got out of line.The footage comes from a marine biologist, Eduardo Sampaio, who spent about a month diving a Red Sea reef. The fish do the searching. A few goatfish fan out, sniff out prey hidden in the rocks, and hover over the spot to show the octopus where to strike. The oc