I understand why he had no choice but to take part of the rivery and take the treasure in the pagota or he would’ve never see his sister nor his little brother alive again as they were taken,kidnapped and later reunited with them,his family knowing he would ever it took to five floors six men before entering the pagota it was suppose to be taking out ten fighters outside the pagota guarding it but the real action is inside the pagota
Source:
http://www.watchlosttvshowonline.com/bruce-lee-game-of-death-lost-footage-of-the-pagoda-fight