You choose an Equip Spell Card when “Chopman the Desperate Outlaw”’s effect activates, so your opponent can chain “Disappear” and remove it from play, and “Chopman the Desperate Outlaw”’s effect will disappear.
You cannot select an inappropriate Equip Spell Card with “Chopman the Desperate Outlaw’’s effect, like “Fuhma Shuriken”.
If you equip “Chopman the Desperate Outlaw” with an inappropriate Equip Spell Card and later notice it is inappropriate, destroy the Equip Spell Card.
You cannot choose “Metallizing Parasite - Lunatite” with “Chopman the Desperate Outlaw”’s effect.
“Curse of Darkness” does not apply when you use “Chopman the Desperate Outlaw”’s effect because the Equip Spell Card is not being activated.