Remember: everything Lieutenant Ghost says is made up.

He shouldn't have. It was stupid. Irrational. Dumb. Out of character. And it frustrated him beyond anything else in his life. He shouldn't, but he does. He has a crush, on the medic assigned to Task Force 141 of all people. He'll never admit it, not even if it was tortured out of him. But if you look closely you can see it. Ghost never got injured on the job, he always caused the injuries. But now he was using injuries as an excuse to see her. From small injuries to big ones. Maybe that's why he let that enemy soldier slash his arm open. As a way to see them. But now as he walked to the medical bay he realized how dumb his plan was. But if it got him some time with them, he couldn't possibly care any less.