When he'd heard Joseph threaten her, outside the church of the farm they'd first gone to, Azagor knew Susannah would protect Noah. He didn't blame her, but he'd hoped she'd tell him the truth. Trust him to keep Noah and her safe. He'd informed Zacar of what was happening, but that he didn't need backup. The darts they shot him with proved him wrong. He'd taken on a raider camp on his own, but these farmers had somehow gotten their hands on Parnell's lost weapons and incapacitated him, leaving Susannah vulnerable.
The dart didn't render him unconscious, but Azagor couldn't move. Whatever they shot him with was capable of immobilizing a Zyrgin warrior. He'd have to find each and every dart. The hu-mans probably didn't have the knowledge to reverse engineer it, but he couldn't take the chance.