Sam zoomed past the two guards and in-process burst open their chests with his fists. They died on the spot. Specter went to them and did what he was told to do.
There was not even much commotion for the other guards to become alert. Everyone is busy with their own task.
He ran towards the nearest guard post and climbed upwards. He held the two guards by their necks and jumped downwards, with their faces hitting the grounds first and their heads burst open because of the force Sam applied on them from the back.
This time, the commotion alerted the guards and they started moving. Sam didn't bother hiding or trying to run. He is not in a mood for cat and mouse, he doesn't want them to chase him while he takes them down, he came here to blow off some steam and he would do exactly that.
He ran towards the first guard that showed up as he dodged the ranged fire attacks coming at him.