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Translation

• Context: "Metal Bat," Kinzoku Batto 金属バット, explains why he's stronger after suffering injuries.
• otoko wa {dare ka wo mamoru} toki ni ichiban chikara ga deru mon daro
  漢は誰かを守る時に一番力が出るもんだろ
  A man [is at his strongest] when {[he] is protecting someone}, isn't that right?
  • chikara ga deru
    力が出る
    Power gets out. (literally.)
    Strength bursts out.
  • i.e. when a man has someone to protect, he can bring out more strength than otherwise.