Darkness Approaches
Normal Spell
Discard 2 cards from your hand. Select 1 face-up monster and flip it face-down, but do not change its battle position.

Can you use this card to put an attack position monster to face-down attack position? If yes, does any flip effect activate? Afterwards, can you voluntorily flip a face-down attack position monster to face-up attack position? Can you attack with a face-down attack position monster? If yes, then what is the ATK of the face-down attacking monster?

Yes, you can flip a monster into face-down ATK with that card.

If it has a flip effect, it will activate when you flip summon it or if it is attacked.

If attacked, it will flip face up in the damage step and be treated as a monster in face-up attack.