Apenas uma teoria, eu poderia estar completamente fora do alvo aqui. Nos livros há dois casos em que Riptide não retorna para Percy Jackson.
Sem bolso, sem caneta:
A espada retorna ao bolso de Percy e não a ele.
“I reached for Riptide, which I always kept in my pocket, but then I realized I was wearing gym shorts. I had no pockets. Riptide was tucked in my jeans inside my gym locker. And the locker room door was sealed. I was completely defenseless.”
The Sea of Monsters, Chapter 2, I Play Dodgeball with Cannibals
Godly Blocker:
Deuses têm poder para impedir que a espada retorne a Percy.
Percy glanced at Hazel and Frank, who didn’t seem to find anything odd about this. Still, he wasn’t wild about handing over a deadly weapon to a kid.
“The thing is,” he said, “the pen returns to my pocket automatically, so even if I give it up—”
“Not to worry,” Terminus assured him. “We’ll make sure it doesn’t wander off. Won’t we, Juila?”
“Yes, Mr. Terminus.”
The Son of Neptune, Chapter 13, Percy
Neste caso, as roupas de Percy estavam pegando fogo
“I turned and jumped. My clothes on fire, poison coursing through my veins, I plummeted toward the river.”
The Lightning Thief, Chapter 13, I Plunge To My Death
mas seu bolso não foi danificado:
“I capped my sword, stuck the ballpoint pen in my pocket. “Thank you, Father,” I said again to the dark water.”
The Lightning Thief, Chapter 14, I Become A Known Fugitive
Quimera é um demônio e não tem o poder possuído pelos deuses, ele não pode impedir que a espada retorne a Percy. Echidna poderia ser um caso diferente, porque ela poderia ter um Deus ou Titã como pai / mãe .
Ela até ousa Percy pular no rio e recuperar Riptide.
"If you are the son of Poseidon,” Echidna hissed, “you would not fear water. Jump, Percy Jackson. Show me that water will not harm you. Jump and retrieve your sword. Prove your bloodline.”
The Lightning Thief, Chapter 13, I Plunge To My Death
Vamos considerar a distância agora! Neste caso, a espada caiu 630 pés.
Annabeth stood behind him, trying to look angry, but even she seemed relieved to see me. “We can’t leave you alone for five minutes! What happened?”
“I sort of fell.”
“Percy! Six hundred and thirty feet?”
The Lightning Thief, Chapter 14, I Become A Known Fugitive
No caso de The Titan's Curse, a espada caiu 50 pés
Despite how much I hated him, I couldn't stand to see it. I wanted to believe he was still alive, but that was impossible. The fall was fifty feet at least, and he wasn't moving.
The Titan's Curse, Chapter 17, I Put On A Few Million Extra Pounds
Chiron afirma explicitamente que a espada não pode ser perdida.
“You can’t,” Chiron said.
“Can’t what?”
“Lose the pen,” he said. “It is enchanted. It will always reappear in your pocket. Try it.”
“I was wary, but I threw the pen as far as I could down the hill and watched it disappear in the grass.
“It may take a few moments,” Chiron told me. “Now check your pocket.”
Sure enough, the pen was there.
The Lightning Thief, Chapter 10, I Ruin A Perfectly Good Bus
Portanto, tudo se resume à distância entre Percy e Riptide ou Echidna usando poderes como Terminus para impedir que a espada retorne a Percy Jackson.