Boozer's agent coulda said: "I'll get back to you sometime this year." He coulda said, "No, we're lookin for a better offer, and won't take that." Thorn, Pelinka, and everybuddy else knew that IF Boozer signed a contract with another team, it would hit the newswires instantly. No one would have to wait for a call from the player's agent to know if that happened, whether promised at noon, 3 PM, or any other time. Hence the implication that Boozer was gunna continue to consider offers throughout the day. Boozer merely used the Nets offer as leverage to get more from Chicago.
But, as has been noted, Boozer is probably usin the Bulls' offer to demand more from NJ, as we speak, so it remains to be determined who actually gets double-crossed, I spoze.
Suppose you went for an interview to 2 places, and you had a preference for one of them. One of the places gave you 75K, and you were still waiting for the other offer from the place of preference. Wouldn't you thank them and tell them you will get back to them and think that you want to hear the offer from the place of your preference first? And when the place you refer gives you 80K (and sure you could have mentioned to them you already had an offer in place), wouldn't you accept that offer and then at some point later call the first place saying you decided to accept a different offer? This just seems like common sense.