Palmer's kind of surprised his shot actually worked. The Fallen's death flares up something in him, something aggressive. This is the first time Palmer's intentionally killed something larger than a mosquito in his entire life. He's not a violent man, but he just committed a violent act. He feels a flush of something. Anger? Pride? Adrenaline?

"See?" His voice is a snarl. All the Fallen seem to understand is violence, and he's killed one of them. He's furious, turning from the body, ready to shoot again if he has to. "Am I worth your respect now?" He's not expecting an answer, and this time his guard is up.

Next he takes a shot at the assassin facing Matt. Even if he can't pierce the armor, two on one is better than one on one, and Palmer's settling into his role in the fight, picking off wounded Fallen as his teammates injure them.