I have no idea.
I honestly didn't even know there was a muscle called rhomboid.
I was trying to tweak my movement and positions so that I would feel it in my tris more. I went down on the third rep and heard a crunch at the bottom of my neck, kinda between my shoulderblades, and a little to the left. One of my best friends stretched it out really well (he's a physical therapist) and told me that it was either my rhomboid or sub something. He also told me to lay off it until three days after the pain subsided. I'm not a happy camper.