It called for an urgent hui about how Maori rights over fresh water are recognised. The tribunal issued its report on claims brought by the council and 10 hapu and iwi, which seek to delay the Government's partial asset-sale programme until Maori claims over water are considered.
At first, Mr Key said the tribunal's decision would not stop him - but a week is a long time in politics. His political ally, the Maori Party, has put pressure on him to delay the sale and he has probably received Crown legal advice that there might be more pitfalls ahead.
He has made the right decision and will use the time to consult with Maori. One can't help thinking Mr Key may have painted himself into a corner on this one.
He may find himself consulting more people than he originally thought he would have to. This is good for democracy but not necessarily good for Mr Key's plan to sell state assets. Already his political foes, Labour and the Greens, are demanding that he consult all New Zealanders by holding a referendum.
The Green Party is in the Keep Our Assets coalition, which has collected 240,000 signatures as it strives to get the 310,000 needed to trigger a citizens' initiated referendum. The coalition has launched a drive to collect the remaining signatures by the end of next month. Mr Key would not have to listen to the referendum result but it would put him under even more pressure.
Suddenly it does not seem like it is all smooth sailing for the National Government. Our populist Prime Minister is probably aware of how much he has to lose if he gets this one wrong. Only time will tell. Andrew Austin is editor for Hawke's Bay Today newspaper