Dancing is seen as a sin because it is vain enjoyment and to dance in the forest doubles the offence. At first we think dancing is the only evil doing which has taken place in the forest but we soon realise they have been up to much more, including the conjuring of spirits which is seen as the biggest sin of all. When questioned about the night by her uncle, Abigail denies everything as she knows the girls will be in a lot of trouble, maybe even accused of witchcraft and possibly hanged if they are found out.
We soon recognize that breaking rules is not something new to Abigail; its something she does a lot of. She had an affair with John Proctor while working at his home as a servant to the Proctors but once Elizabeth Proctor started to become suspicious she threw Abigail out and hired Mary Warren in her place. However, Abigail is still in love with John even though John insists that it is over. He knows he has done wrong and he wants to make up for his sins and is trying to make things right with his wife.