This song is played when Armin Artlert is distracting Colossal titan
from realising that Eren is already turn into human after turns
his Titan form into rock in order to fill the hole in the wall.
Armin sacrifice himself by letting Colossal Titan
release hot fumes thus burning Armin to his death.
Soon,when he realised what Armin done,
it is too late and Eren slain Colossal
titan and bring out Colossal Titan in human form.