If one uses Shadow Evocation on a willing ally (e.g. Telekinetic Charge) can they choose not to disbelieve?
Nondamaging effects have normal effects except against those who disbelieve them. Against disbelievers, they have no effect.
Creatures encountering an illusion usually do not receive saving throws to recognize it as illusory until they study it carefully or interact with it in some fashion.
A successful saving throw against an illusion reveals it to be false, but a figment or phantasm remains as a translucent outline.
A failed saving throw indicates that a character fails to notice something is amiss. A character faced with proof that an illusion isn't real needs no saving throw. If any viewer successfully disbelieves an illusion and communicates this fact to others, each such viewer gains a saving throw with a +4 bonus.
Voluntarily Giving up a Saving Throw
A creature can voluntarily forego a saving throw and willingly accept a spell's result. Even a character with a special resistance to magic can suppress this quality.
If I understand the above correctly,
- If the ally believes the caster actually cast Telekinetic Charge, it seems they get a save which they could forgoe and so be guaranteed the benefit of the spell. >> We're good here.
- If the ally knows the caster didn't cast Telekinetic Charge, (say because of a high Spellcraft check or because she knows the caster's spell list) they have proof that the illusion isn't real and so need no saving throw. >> Even though she "needs no saving throw", can she still choose to forego the save and be effected by the spell?
In other words, I think the question boils down to: Does one always have a choice not disbelieve an illusion, even when one has proof that it's not real?