The odd scenario before you is a new LEGO creation featuring seraphim and cherubim by Haoming Qiu called “Social greeting between two angels”. I imagine the dark one says “Howdy do! I’m all dark and brooding and stuff”. Meanwhile the other angel is like, “Sup, brah? As hideous as I am, I’m actually a biblically accurate angel”. Then the dark one is like “cool, brah!” At least that’s my interpretation of the story. The builder didn’t offer any other clues. Let us know in the comments if you have a different dialogue for this admittedly fantastic pair.