Tea and Sympathy
for Angelic Temptress (spoilers for this week's JLU)
It is not an understanding, not really. Rather, there is a sympathy between them. Shayera has taken on the role of the killer in their group, and Bruce will never kill, but understands someone must sometimes.
They drink together, not the way their friends do, with laughter and stories, but with the silent closeness of those who gaze into their liquor knowing what it is like to live in hell every day. He's a confidante.
After Carter, hot rum on her breath, she tells Bruce she has no future. Whiskey on his tongue, he whispers that he knows she does.