Answer: He is anxious to leave because he has realized that he took part in a great deception. His hasty departure reflects his state of mind in that he starts to panic and is afraid of what will happen when the authorities find out about this deception.
Explanation:
Friar Laurence is an important character in the play, since he is involved in the main plot and is the one who helps Romeo and his wife run away together. In Lines 155-159, Laurence becomes aware that he took part in a deception - he helped Romeo's wife fake her death. He also becomes aware of the consequences of his actions, which he will face once the authorities find out what he has done. This is why he insists that Romeo's wife leaves the vault with him, but when she refuses, he hurries up to leave before the authorities arrive.
