It's called "Person #2's eyes aren't connected to Person #1's brain". Try reading data from iago's hard disks without being connected to him in any way. It has nothing to do with a "spirit" or "soul", they are two disconnected entities. Person #2 is Person #1, but #2. It's like..if I loaded an MeBot bot as R.a.B.B.i.T in op x86, and then a MeBot as R.a.B.B.i.T#2 in Op ASODH, even though I'm using the same bot and the same username, they are seperate programs (even though they are identical), and R.a.B.B.i.T can't see what people in Op ASODH are saying, and R.a.B.B.i.T#2 can't see what people in Op x86 are saying.
Although, everyone has a soul anyways ^^