Piper didn't expect a song when she went down to find Leo. He had been cooped up for days trying to "fix" the engine, after that talk with Asclepius, he was probably trying to escape talking to Jason and her about what that meant. So when she went to drag him out of that room and have a talk she would have never expected to hear Leo singing.
Well I heard there was a secret chord
David played to please the lord
But you don't really care for music, do ya
She was surprised to say the least, her best friend was a great singer and she was just hearing now.
Well it goes like this the fourth the fifth
Minor fall and the major lift
The baffled king composing Hallelujah
Hallelujah, Hallelujah, Hallelujah, Hallelujah
She knew this song it was 'Hallelujah', sung by Bon Jovi. And when Leo sang it, it had a sad sound to it, like he was trying to find hope in the darkness. And considering his life she wouldn't be surprised, except that he had friends now.
Well your faith was strong but you needed proof
You saw her bathing on the roof
Her beauty and the moonlight overthrew you
She tied you to the kitchen chair
She broke your throne and she cut your hair
And from your lips she drew the Hallelujah
She heard a creak, and turning around she saw Jason standing behind her, eyes wide hearing his best friend sing.
Hallelujah, Hallelujah, Hallelujah, Hallelujah
Baby I've been here before
I've seen this room and I've walked this floor
I used to live alone before I knew you
And it's not your flag on that marble arch, no
Love is not a victory march
It's a cold and it's a broken Hallelujah
Hallelujah, Hallelujah, Hallelujah, Hallelujah
That's when they realized, that Leo has already lost so many people and has never loved someone in a relationship, and how hard it would be to lose their friend and family, both on the ship and at home.
Well there was a time when you let me know
What's really going on below
But now you never show that to me, do you?
Well remember when I moved in you
And the holy dove was moving too
And every breath we drew was Hallelujah
Hallelujah, Hallelujah, Hallelujah, Hallelujah
Well now maybe there's a God above
But all I ever learnt from love
Was how to shoot somebody who outdrew you
And it's not a cry that you hear at night
It's not someone who's seen the light
It's a cold and it's a broken Hallelujah
Hallelujah, Hallelujah, Hallelujah, Hallelujah
Hallelujah, Hallelujah, Hallelujah, Hallelujah
Now as they snuck away, they realized that, of someone didn't come back at the end of this trip, their whole group would never be the same. So the hoped, just hoped that they would all make it through this.