It’s the bombing of Alexandria, which was not planned at all. Negan was throwing bombs at a house when Carl is running because he remembers that he hast to grab some thing you and Carl have been dating since you arrived at Alexandria and he almost gets bit by walker and Rick is holding you back because he loves you too like you’re his own and he has to watch along with you Carl getting attacked. Till you immediately run to try and grab him but it’s too late he got bit. You and him make it out.