"I know what we have to do." Phoebe told them, a grim look on her face.
"What?" Prue asked.
"You're not going to like it." Phoebe warned before explaining. "One of us has to bind our soul to Paige's soul, then expel our soul from our body. When they expel their soul, their spirit will become part of her spirit."
"How will that help?" Piper asked.
"Once the two spirits are joined, whichever one of us does it will be able to convince Paige that she is wrong. We can use memories, thoughts, anything to make her remember she never did anything to deserve to be locked up."
"So how do we get out afterward?" Piper asked.
"Leo, can you help us with this part?" Phoebe said turning to their whitelighter.
"Paige can expel your soul by signing her name in blood on your forehead and saying the binding spell backward." Leo explained.
"What if she doesn't get better?" Piper asked again.
"Well…"
Before Leo could answer Prue, who had been quiet throughout the conversation spoke up, "I'll do it."
"Prue?" Phoebe said.
"I want to do it, I can't forget that my baby sister had to go through so much. I need to do this for her as much as for me."
They didn't argue with her, it wouldn't have worked anyway. The three of them walked upstairs, and Leo orbed the still unconscious Paige up to the attic and they began to get the preparations ready.
Paige and Prue were placed in a circle of candles. Prue pricked first her finger, and then Paige's finger. Taking a drop of her blood, she put it on Paige's wound and recited:
Spirits two,
One become,
Mine to hers,
Till it is done.
Prue's body fell over, nether moving or breathing.
"How do we know she's ok?" Piper asked Leo.
"We have faith and we wait."
And so they did.