If “Guardian Sphinx” is turned face down, all Equip Spell Cards equipped to “Guardian Sphinx” are sent to the Graveyard.
If “Guardian Sphinx” is in face-up Defense Position and uses its effect to turn it to face-down Defense Position, “Guardian Sphinx” may be Flip Summoned if it has not had another position change, or was summoned, this turn.
If a “Guardian Sphinx” Special Summoned by the effect of “Call of the Haunted” successfully uses its effect to turn itself face down, “Call of the Haunted” remains on the field meaninglessly.
If “Guardian Sphinx” is Flip Summoned and “Torrential Tribute” is chained to the effect, “Torrential Tribute” will resolve first destroying all monsters on the field.