Does acceptance outside the session validate a delayed offer in marriage contracts?

Primary text

A narration transmitted by Abu Talib from Ahmad indicates that if a group asks a man to marry someone to another, and the man says, "I have married her for a thousand," and they return to the prospective husband who then says, "I accept," this constitutes a valid marriage. Al-Qadi interpreted this as the offeror having appointed an agent to accept the contract within the session itself.