When Abigail relates her version of what happened in the forest lends credibility to story?

When Abigail relates her version of what happened in the forest, the fact that she accuses Tituba of leading them and making them see "yellow birds" lends credibility to her story. This is because Tituba is a known outsider in the community, and the fact that Abigail would accuse her of something so outlandish suggests that she is telling the truth. Additionally, Abigail's story is consistent with the stories of the other girls who were involved, which further supports its credibility.