Why might hunting cuttlefish send moving bands of color across their skin?

Answer: The moving pattern may confuse prey about the approaching cuttlefish

The moving pattern may confuse prey about the approaching cuttlefish ✓ — Moving skin patterns may interfere with how prey see an approaching cuttlefish. One proposal is that the moving bands mask visual cues to its approach. The function is still being investigated; describing it as literal hypnosis overstates the evidence.

The changing colors warm the muscles for a faster attack — These skin displays are not a way to heat the hunting muscles. Muscles control pigment organs that alter the visible pattern, rather than converting the pattern into a burst of body heat.

The flashing skin lights up prey like a searchlight — These moving bands change the appearance of reflected light; they are not a searchlight shining onto the prey. A proposed benefit is interference with the prey's visual perception, not illumination.