the point is Jesus and the Apostles never failed in their miracles and they were specific and whole in their works.
Whoever this person is, he is holding himself out to be a prophet of healing and since he does not have 100% success and can repeat it over and over, then he is a charlatan and may be leading this young woman to her death.
Actually, there is a specific instance in the Bible where the Apostles DID fail, though it was in the aspect of casting out of demons.