 However, Leo and Piper have Mist-induced memories of meeting and becoming friends with Jason.Leo uses his sarcasm and wit to hide his feelings, especially in regards of causing his mother's death.He sometimes thinks of himself as a seventh wheel, (as for the first three books of the Heroes of Olympus series he is the only person aboard the Argo II without a significant other) though he proves no less important or skilled than the others.