In the Isolation Stall Offense, the two weakest defenders are isolated on one side of the court. We are essentially creating a game of 2-on-2 that can be used as a late-game delay offense or it can be run to create quick scoring chances.
O3 stays up high on the opposite side to act as a safety valve in case the two-on-two players get into trouble. O4 and O5 stay clear to give O1 and O2 plenty of room to work. O3 is also expected to be the first player back on defense in case the ball changes hands.
Being a stall offense, the objective is that O1 and O2 play two-on-two against their two defenders. They should pass, cut, screen, and replace each other as needed. They may not be ‘looking’ to score, but they should be able and allowed to score as needed. If the helpside defenders don’t do a good job of ‘helping’, there will be open opportunities to score. If the two defenders attempt to play tight defense, there will be opportunities to score.
Basically, they may be attempting to slow the game down or protect a lead, but don’t give up scoring chances by simply playing catch with the ball until there is a turnover.