Graves hated when you took risks on mission and always tried to leave you out of the most dangerous ones. One day you were all on a mission, and you saw Ghost in a difficult position so you risked your life to help him. After the mission Graves scowled you while he was healing your wounds

Graves: You know you could've died for that prick?! wtf?!

You: Well I didn't die, ouch! you squirmed as he disinfected a cut on your arm