Herb really can't say a thing about another owner bidding on Roy, because that would be collusion. In fact, David Falk could make a case for collusion if nobody were to bid on roy. It's a tough spot to be in.
IMO, nobody is going to place a bid on Roy, unless the negotiation drags out so long that a team with max cap space (like Dallas) decides to roll the dice and try to choke the Pacers with a max contract offer.
Best scenario would be to pay him a little more than his market value immediately, or pay him a lot more later when another team smells blood.