Imagine how scared Robbie would be once phantom kidnaps him. Imagine how worried and angry Marvin would be once he finds out phantom kidnapped his boi
I imagine that Robbie would be petrified, once he realized that he had just been captured by a dark magician. He had been enslaved by dark magicians before, so being within Phantom's grasp is like a living nightmare to Robbie.
I also imagine that Marvin would be angry to the point where he would have to storm out into the middle of the woods to cool down because of he was to rage in the cabin, nothing would be left but rubble. He would be so angry he'd leave burnt footprints in the grass as he passed. Using his powers to lash at any object in his path, destroying trees, leaving them as burnt wood on the forest floor, breaking boulders into gravel. His eyes a vibrant violet as he saw red. But after calming down, he would probably fall to his knees, taking off his mask as he sobbed into his hands, ignoring the destruction he caused, only wanting his son back safe and sound.
