What constitutes substantial evidence in a sexual assault case when the victim bit off part of her tongue?

As mentioned, the victim told the investigator that during the assault she bit a portion of her tongue off and she saw a chunk of it on the floor. A single witness's testimony alone constitutes substantial evidence. (People v. Young (2005) 34 Cal.4th 1149, 1181.) In addition, the investigator followed up by taking a photograph of the victim's tongue, which apparently revealed an ongoing disfigurement. Even defendant's lawyer counseled the jury that not all tongues are symmetrical. It was the jury's

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