That’s very possible. I think the mirror box would likely help, it will reflect those thoughts and feelings and energy’s right back to himself so that you don’t get affected by them.
Tip: aluminum foil works great and is less expensive than mirrors. A clay poppet can be made from flour, water and salt and then decorated or dressed to represent him if personal concerns, or photos are unobtainable - I tend to think the effort put into the poppet makes a stronger link than a photo anyways.