As you were helping the others get out of the water after escaping the pirate Drowneds, you saw green fling his turtle shell helmet to the ground and sit at the end of the cavern, looking at a group picture of all of us before bursting into tears

You and the others had recently split up from your leader of the group, TSC, after an argument, and it seems Green is starting to miss him, or its homesickness, or both, its probably both, actually, him and TSC a practically best friends