"They can't hold us forever little brother. Three of the four of us are here and we will find Gabriel. Whatever our differences are, whatever is coming, or happened...we won't allow others to harm any of you." Lucifer puts him in such an awkward position, especially with Samandriel - he doubts the young angel even remembers Lucifer beyond the Fall, he's the only one to have witnessed Raphael's inner distress over that event, and Raphael really should be working to put distance between Lucifer and the others, and yet...

He's not. He doesn't want to. He wants his older brother. He doesn't yet know how to handle it.