By Geoff Lepper
48minutes.net

OAKLAND — Warriors coach Don Nelson knew what other teams thought when they came into Oracle Arena.

“Not being able to win and not being able to do what we want in the fourth quarter . . . good teams figure they can beat us,” Nelson said.

With Stephen Jackson back, that no longer can be considered a safe assumption for Warriors opponents. Just ask the Boston Celtics after Jackson dropped 15 of his game-high 28 points on them in the fourth quarter of Golden State’s 99-89 win on Friday.

As mentioned in the live thread, this was the perfect setup for an underdog to knock off the Celtics: Not only was it the second half of an all-road back-to-back for Boston, but the Warriors also had 72 hours between games.

What tipped the scales, however, was Jackson’s return from a four-game absence to allow his sprained left hand — an injury that coincided with a brutal 26.9 percent shooting stretch (21-for-78) — to finally heal.

More specifically, it was Jackson’s fourth-quarter presence that made the difference. After a first-quarter individual showdown with Paul Pierce that ended in pretty much a draw (Jackson had 11 points, Pierce 13), Jackson disappeared in the second and third periods, shooting a combined 1-for-5 and committing five turnovers.

But there were signs of a recovery in the third. Jackson didn’t cough the ball up once in the final 17:45 of the second half. His one make came with the shot clock in single digits and against some tight defense from Pierce [3, 3:19]. And his specialty, the touch pass, led to an open 3-pointer for Marco Belinelli [3, 0:55.7].

When Jackson launched an ill-conceived drive down the lane, was blocked by Leon Powe and unleashed a frustration foul on Brian Scalabrine in the scramble for the rebound [4, 9:15], it seemed like Friday’s top storyline would be how the captain was still not fit for duty.

A layup off a crisp entry pass from Anthony Morrow got Jackson rolling [4, 8:42], and he didn’t stop the rest of the way.

The Warriors trailed by five before that bucket; they led by nine a little less than 4 1/2 minutes later, with Jackson scoring 13 of Golden State’s 18 points and assisting on three more — a trey from Kelenna Azubuike [4, 7:46].

Jackson drained a pair of 3-pointers of his own in that stretch, one with Pierce’s hand in his face on…