When a blue spots a yellow, it usually involves bobs by the blue and
no signalling by the yellow. Somehow the blue recognizes the yellow and
will attack if the yellow is on the blue male's territory. In this case,
the blue roots out the sneaker, which is hidden deep in the grass. There
is a skirmish (with sloMo replay at 1/4 time), the blue bobs victoriously,
the yellow slinks into a crack and lives to sneak another day. Though the
Yellow sneakers are continually being run off by Blues, the Yellows are
also quite wary and always on the look out for the dominant Blue. No doubt
because the dominant Blue can beat the snot out of them. See another Yellow vs Blue sequence in which the sneaker gets
away clean, and the blue comes up empty.