To be fair to jumping spiders, if you were to put a human into a room with only red light they also start losing all sense of depth. Mostly because suddenly most objects suddenly turn black :) And looking at nightclubs, humans will definitely start courting dances once you turn down the lights... not sure jumping spiders have nightclubs, though :o)
So, I have an intense fear of spiders. Or at least, big ones, so these little guys are pretty fine for me, long as they don’t get too close. This is cute :D
Courting the cricket was so funny to watch. If you used the same area to do the trick as the female spider then she had probably left trails of her silk behind which he can smell/sense hence why he thought he better break out the dancing just in case. Jumping spiders use the scent of a female jumping spider’s silk to find them in the wild by following it - maybe he thought the cricket was a messenger sent by the girl.
Maybe Ao-chan was practicing his dance moves, and wanted the cricket's advice? Or maybe he is a super-genius, trying to confuse us, just to amuse himself!