Eridan heard the shout, pinpointed the general direction of where it came from, and he knew. Had been watching every time Gamzee flash stepped around the house, in their duels, in general, ever since he noticed the pattern to the steps. Weeks of goading the subjugglator into miniature duels and trying not to be obvious in observing his step pattern. Days of memorizing it. All down to this.

By the time Gamzee went to swing, Eridan had already turned on him, and grabbed the wrist of the hand swinging the club. His wand was at his kismesis' throat.

"Checkmate."