Hey I have a novel idea! Why don't you find the buyer, YOUR CLIENT, the house he/she wants instead of trying to find a way to strong arm them into buying one they don't want.
First off, how do you know this guy works for the buyer? Maybe he's the seller's agent here asking a question.
Second off, how do you know that's what he's trying to do if he DOES work for the buyer? Maybe he's trying to figure out the repercussions on behalf of his client if his client walks away.
Sheesh. Judgmental much?