I will try and answer this question for you.
When you have an NDE the field that keeps you trapped in the body shuts down which is normal upon death, you are ejected from the body which is disorentating for an isbe that has no memory of what they are or who they are, the trap is triggered and you are programmed to enter the trap. The isbe is connected to the body via a tether of sorts as the body is uniquely coded to the isbes individual wave length. The trap always has a aesthetic wave that is very attractive to isbes and to start with looks like a paradise. A check is made of the condition of the sleeve/body, if the body is deemed to survive the isbe is released to return to the body. Earth is a prison planet sowed with chaos to prevent fast advancement of technology which would lead to our escape.
The purpose of the trap mechanism is to lower the power of the isbe and disrupt the isbe's ability to remember who they are and there past exploits, this is the worst thing they can do to an isbe and is abhorent in its cruelty, all humanity is from other planets and have been dumped here sometimes for not paying taxes or free thinkers or the usual murder mayhem etc. 80% are in fact innocent isbe's.
The Domain lost batallion when there body breaks are instantly recycled by the trap mechanism's and don't even get to visit the false heaven because they pose the greatest threat of escaping this prison.