I think that if Saruman still had his ring when he left Isengard, then he may well have been able to call on its innate power in some way to enhance the power of his voice. Maybe this is what Gandalf alludes to when he says, "but this snake had still one tooth left", and later Saruman himself may not have issued empty threats when he says, "But do not think that when I lost all my goods I lost all my power. If the ring had any power, then that power remained, as with The One Ring after Sauron was defeated, others used its power.
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