What did Melanie's dad say the reason was for Marshall never the r to put down security The Egypt game?

In "The Egypt Game," Melanie's dad explains that Marshall never puts down security because he is very attached to it and feels a sense of comfort from having it nearby. He is also quite protective and uses it as a way to feel safe in their imaginative play. This attachment highlights his character's innocence and need for reassurance in their adventurous world.