Brotherhood of the Fire Fist - Gorilla

The monster effect "Once per turn, when this card destroys an opponent's monster by battle and sends it to the Graveyard: You can Set 1 'Fire Formation' Spell Card directly from your Deck" is a Trigger Effect. (It does not target.)

The monster effect "You can Set 1 'Fire Formation' Spell Card directly from your Deck" is an optional effect that can be activated at the end of the Damage Step when "Brotherhood of the Fire Fist - Enshou" destroys an opponent's monster by battle and sends it to the Graveyard.

If "Brotherhood of the Fire Fist - Enshou" battles a monster with the same ATK and both are destroyed, you cannot activate the monster effect "You can Set 1 'Fire Formation' Spell Card directly from your Deck."

The monster effect "Once per turn: You can send 1 face-up 'Fire Formation' Spell/Trap Card you control to the Graveyard; target 1 Spell/Trap Card on the field; destroy it" is an Ignition Effect. (It targets 1 Spell/Trap Card on the field. When activating this effect, you send 1 face-up "Fire Formation" Spell/Trap Card you control to the Graveyard as a cost.)