Why, if the power of empathy could be transferred by touch, did Prue, who could not emotionally handle the power, just give it back to the priest when he came into the basement? She could not handle it and he wanted it back! She could have given him his powers back and then just worked with her sisters to write a spell to vanquish Vinceres. It was just their powers he was immune to. It was never said that he could not be vanquished with a Power of Three spell. Prue was not originally in the mindset to vanquish Vinceres anyway, so you'd think she would have jumped to give the priest back his powers.