it would make sense when the spear entered his chest, because he was brutally scourged you expect the water fluid to come out. >> lauren: the shroud still reveals important forensic clues. >> we have blood stains on the head, as if from a cap or crown of thorns. >> the thorns are very, very harp. >> the type of a pain, when irritated that comes across the face. and, the pains are terrible. >> we have blood stains at the feet, where the crucifixion wounds -- nail would have been driven. >> and would nail each foot separately, and, they were trying to save the nail and it is extremely difficult to nail both feet, one on top of the other. >> lauren: he agrees, based on the only direct evidence, ever found of a crucifixion. a roman male, going through a single heel bone from 7 ad.