People will also stack bandages or regs on top of a field, so they can peek inside your house, and raise themselves off the ground. People will also place fields on 2nd floor so they can peek in too. We have this guy on Baja who has been doing the SAME crap for like 8 years and can do chain lightning to someone on the 3rd floor in the back of the house with the reg trick. I believe shurikens will find their way into a house as long as there arent solid walls. What I do is on my 3rd floor, I made a half walled crafting area that is blocked off from this stuff.