Souls aren't physical. From what I know, souls are just your collected consciousness. They are not a matter or an energy. So their interference in physical world is absolutely impossible. Souls possess nothing. They are hollow.
I imagine them to be white balls. Hollow,plain and shapeless.
The stronger a light shines the darker are the shadows around it.
'Idhuvum Kadandhu Pogum "
Even this challenging situation would ease