The event that caused the exchange between Abigail and Proctor was Proctor rejecting Abigail's attempts to rekindle their relationship.
A sudden change in a story can occur when a character takes an unpredicted step which may lead to the elimination of a major character.
Abigail, a servant of Proctor, who expresses her wish to renew an affair with Proctor. He refuses yet Abigail will not relent. This event lead to the death of Proctor.
Therefore, the event that caused the exchange between Abigail and Proctor was proctor rejecting abigail's attempts to rekindle their relationship.
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