Marcus was feeling nostalgic.
His entire life he had been ordered by his mother to find and slay demons.
From the very first day he gained any sense of awareness he was forced to endure her end her weird obsession with the idea of killing anything that was fuelled by cursed energy.
He wasn't entirely sure why this was so important for her. At first, he just assumed that his mother some kind of noble soul that felt joy by helping humanity and was trying to free them from the menace of demons.
But that didn't felt right.
His mother didn't seem to show any signs of honestly caring about the people around her. Not even Marcus himself.
She always looked at him as if he was just some tool that she was using to finish up her goal.
Marcus probably would never have noticed her weird behavior and start acting suspicious of her if it wasn't for his father.