Renaissance Man Learns

At shabbat dinner the other night, a friend of mine was talking about the evil that existed in his sister's old house, and as he spoke more about it, we could both feel a chill coming up our spines. The house we were in started to take on a subtle energy that didn't feel quite right. Is it possible that the mere discussion of evil spirits from other locations, could summon them into almost any environment?

He then proceeded to tell me how he effectively banished them from the space, at least for a few days or weeks by calling outloud to every crack/crevice & area of open space where evil existed, and forced it do go away verbally, and by reciting the Shma at the top of his voice.

The moment he did this, the wierd energy feeling went away. Strange! Any comments?