Several years ago I was watching a live service held by Norval Hays and when he came to the part about the blood of Christ a big noise began in the distant part of the crowd, it sounded like several men with sledge hammers beating on something. Hays stopped and said, do not be alarmed this happens to me all the time, then he said, bring her on down here. Presently several big men brought a woman down and laid her on the floor, Hays come off the platform and said, I command you(to the spirit)to obey me, come out of her in Jesus name. Immediately the woman went limp and Hays helped her up,she was a classly looking woman and seemed to be very embarrassed and she said in an embarrassed voice,I had a spirit, I am sure she was christian but the spirit did not manifest until the mention of the blood of Christ.