Prima si tira per la RI, se gliela supera c'è anche il Ts.
Spell Resistance (Ex) ha scritto:Spell resistance is the extraordinary ability to avoid being affected by spells. (Some spells also grant spell resistance.) To determine if a spell or spell-like ability works against a creature with spell resistance, the caster must make a caster level check (1d20 + caster level). If the result equals or exceeds the creature’s spell resistance, the spell works normally, although the creature is still allowed a saving throw. (The defender’s spell resistance is like an Armor Class against magical attacks.) If the caster fails the check, the spell doesn’t affect the creature. The possessor does not have to do anything special to use spell resistance. The creature need not even be aware of the threat for its spell resistance to operate.
Probabilmente ti confondi col fatto che le creature con RI possono abbassarla volontariamente (az standard), oppure col fatto che volendo chiunque può rinunciare a fare il Ts.