Harpoon seemed to realize at that point that he had been given an impossible mission. He used a comm of his own to speak to someone and was told that it was good enough. He couldn't do what he couldn't do.
The man threw one last explosive harpoon at the ground in front of Piotr. Rocks went flying everywhere and one of the columns cracked and broke, falling into the crowd. Fortunately no one was crushed but by the time the marble dust settled Harpoon was gone.
Wicked had not followed orders though. After her final act of dismissing the ghosts she had fallen unconscious a few feet behind Piotr.
"Tenebrous here, bring the kid back to first aid, we're regrouping there and then going home."