Trivia: Before getting the role of Walter Donovan, Julian Glover had auditioned to play Colonel Vogel.
Trivia: Kevork Malikyan (Kazim) had previously auditioned for the role of Sallah in "Raiders of the Lost Ark" (1981).
Trivia: Vogel's name is never spoken in the film. It is only mentioned in the closing credits.
Trivia: Despite his prominent billing, John Rhys-Davies does not appear until 53 minutes into the film.
Chosen answer: They're not, no. An individual doesn't become immortal after one drink - it requires them to drink regularly in order to remain alive. So neither Jones has been rendered immortal, merely healed of any wounds that they might have. But your surmise is basically correct - as the Grail cannot leave the shrine, any individual wishing to use it to prolong their life must stay there if they wish to enjoy its effects.
Tailkinker ★
Also, in Indiana Jones and the Kingdom of Crystal Skull, Henry Jones, Sr has passed away before the start of the story and therefore was not immortal.
raywest ★