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Mechanically Barry's mind let Johntha's trained body insert itself into the unfamiliar clothing of the Trendan. As with the paradox of the speech, Barry doubted at the present time whether he could speak any Earthly speech at all without a hard struggle. The words spilled from his Trendan mouth in the proper order to convey the thought generated in his Terran mind and transferred to the Trendan brain.
He was, he admitted, more of Trenda than of Earth. So Johntha's body was the outlet of Barry's mind, and though the mind thought in Earth language, the physical output was instantly transposed into the Trendan analogue.