That reminds me, remember this photo? I don't know if it's ever been proven or not proven that this was not BL.
Photo shows person who looks like Brian Laundrie walking Florida street
This shows a guy with his elbow wrapped up. It's not a tattoo, IMO, it's a wrap of some kind around his elbow, like it was wounded.
In the camping photo, it's the other (right) elbow area that is visible, showing swelling and maybe some bruising.
Think if you are a woman being strangled to death by a man sitting on you, and imagine you have your arms free to move. You might start by trying to dig his hands out of your neck, but he's pressing down too hard. So maybe next you push up on his elbows because that would be the next logical spot to try to get some leverage and relieve the pressure. So his elbow area might have taken quite a lot of physical fighting back from her. Just speculation. But if both of his elbow areas were swollen and wounded somehow, it would make sense that is how she was trying to stop him.
And if this guy is him, that would be evidence of both elbows wounded.
JMO