Shadow Walk visability
Whether someone is in stealth or not isn't calculated when a player moves on screen. I was in Stealth With Shadow walk active and wandered to @LilCassiopeia's plot, but he could see me as if i wasn't stealthed at all.
I did another test. I got @LilCassiopeia to stand still. I activated stealth and he confirmed he couldn't see me. I ran off screen and back again and he could see me perfectly fine.
I just tested this on monsters. It works perfectly fine on monsters. They can't detect you, even if you walk in from off screen.