Flurry of Blows estados:
At 1st level, a monk can make a flurry of blows as a full-attack action. When making a flurry of blows, the monk can make one additional attack at his highest base attack bonus. This additional attack stacks with the bonus attacks from haste and other similar effects. When using this ability, the monk can make these attacks with any combination of his unarmed strikes and weapons that have the monk special weapon quality. He takes no penalty for using multiple weapons when making a flurry of blows, but he does not gain any additional attacks beyond what’s already granted by the flurry for doing so. (He can still gain additional attacks from a high base attack bonus, from this ability, and from haste and similar effects).
Eu acho que isso claramente indica que não deve haver nenhum benefício do Combate de duas armas linha de talentos.
Como tal, no primeiro nível e tomando a ação Flurry of Blows , um Unchained Monk fará dois ataques em STR + 1 (ou DEX + 1 se você tiver a configuração apropriada), e o O talento Combate com Duas Armas não oferece impacto.