Brotherhood of the Fire Fist - Caribou

The monster effect "During the End Phase of the turn this card is destroyed by a card effect and sent to the Graveyard: You can Special Summon 1 Level 4 'Fire Fist' monster from your Deck, except 'Brotherhood of the Fire Fist - Tensu'" is a Trigger Effect that activates in the Graveyard. (This effect does not target.)

The monster effect "You can Special Summon 1 Level 4 'Fire Fist' monster from your Deck" does not activate at the time it is sent to the Graveyard, and does not create a Chain Link. The effect activates during the End Phase of the turn it was sent to the Graveyard, and creates a Chain Link.

The monster effect "If this card is sent to the Graveyard for the Synchro Summon of a 'Fire Fist' Synchro Monster: You can choose 1 'Fire Formation' Spell Card from your Deck and Set it to your field" is a Trigger Effect that activates in the Graveyard. (This effect does not target.)

The monster effect "You can choose 1 'Fire Formation' Spell Card from your Deck and Set it to your field" is an optional effect that can be activated if "Brotherhood of the Fire Fist - Tensu" itself is used for the Synchro Summon of a 'Fire Fist' Synchro Monster, is sent to the Graveyard, and that Synchro Summon is successful. (It cannot be activated if the Synchro Summon is negated.)