How does learning torah give "chiyus to holchei bidrochov" ?
the assumption is that since the energy of J is so intensely manifested on this eve , any spiritual energy that's brought into the world can be "usurped" by that which is impure.
Obviously, this is a concept in spirituality which is beyond the currency of what we deal with here on DDF.
But, if you'd like a great source, take a look at the hakdama to the old chassidic story book called "sipurim noraim". The author does a fantastic job in the hakdamah giving us an understanding of our lack of understanding. It is profound and entertaining simultaneously.