Zayne pulled the sword out of Hugh's neck further adding to his demise as he could not stop the blood and the pain.
Hugh still looked to Gage for help even in his final moments. All his loyalty and this was how he ended? He was better off supporting Zayne to become king since Gage was useless.
Gage didn't feel any sadness for Hugh. Hugh had it coming for poking at Zayne for years and so did the others who thought running to the door would help them. He already informed the guards not to listen to anyone's commands but his or Zayne's since he knew Zayne was coming to the palace to kill someone.
Gage stood back, not needing to help Zayne since he was capable of killing off the men present one by one. It made him think of making it a requirement that the court knew how to use a weapon.
It was pathetic to see them go down so fast but then again, they were dealing with a very angry Zayne.