That's the thing - whatever he and Sara have been to each other, whatever they might be to one another - there will always be that sense of trust and compatibiity. They know one another, they understand one another.

Oliver's focus sharpens as John strips off his shirt and the lines and lights begin intersecting before them. Potential lives and lives changed.

He doesn't recognize the names, either Brainiac or Rip Hunter, but they are absolutely filed away for future reference.

Trust.
A tightness to his expression that's almost, almost a smile. "If I didn't trust the two of you I wouldn't be here."