Final answer:
Reverend Hale is summoned to Salem to prove that witches are loose in the village.
Step-by-step explanation:
The stage directions of the play describe Reverend Hale externally. Parris summons Reverend Hale to Salem to prove that witches are loose in Salem. Reverend Hale is called upon to help determine if witchcraft is the cause of the strange events happening in the village.