In last round’s 15th turn, 1st place decides to hard fold upon picking a 6man by dealing a 8sou, which breaks his tenpai. Folding at this point is understandable. What I don’t understand is why he did this with a 8sou upon receiving a 6man. After all, both the 8sou and the 6man were safe against me, and neither was safe against the two other players. There wasn’t even any suji for those! So that’s my question, why did he discard the 6man and not the 8sou? Was it because the 8sou was safer against the two other players, and if so why?