The head that was removed from Manar had been capable of smiling and blinking but not independent life, doctors said.
So the other head had an independant brain and was capable of showing emotion. It had no body or limbs or organs of its own but had thought and still had feelings. That to me would of been a tough call to kill the other twin having it removed knowing that it can see, smile, most likly think I assume. Of course they are going to say they are unclear if it had its own though. Who would want to step up to the plate and say yes the other head can think. Still wanna kill it? Hard to talk when you dont have your own set of lungs but still a person was in that head and had it removed.