‘ if you love someone let them go.... ‘ and all the rest . Max seems quite capable of playing a long game , maybe having a father like his , who would send him to the arena to prove a point if he had to , has taugh Max both patience and understanding . Be that as it may , he certainly extracted the promise he sought , and a magician can do a lot with words like that. Grim remains and has become even more interesting as he is almost a century old , why would he remain a prisoner in the arena , when he clearly is capable of surviving/ living for such a long period of time . I have a feeling Prism and his return to the world may result in a world of regret for both kings .