Green was fouled while falling down with 23 seconds left and he hit both of his free throws to make it a three-point game.
Armand then threw the inbounds pass right into the outstretched arm of Green, who bounced back behind the 3-point line and lauched a shot to tie.
The ball bricked hard off the back rim, but Mason was able to pull down the long rebound. He tried again from 3-point range and missed. This time, Marvin Jordan came up with the carom, and set up Mason for another chance to tie. Antother miss, another long rebound, now in the hands of Green, who went behind the back and rose up for a fourth 3-point attempt.
Green admitted afterward that he was surprised to get another chance after missing the first 3.
"They went after the ball like it was the last rebound that was every going to happen," coach Joe Mihalich said.
"It's almost like the gods were tipping it out to give them another chance," Cluess said.
Invigorated in overtime, Mason, who led Niagara with a career-high 30 points, drove in for a two-handed slam off the opening tip then banked in a short floater to put Niagara up 85-81.
But a Mason turnover, blocking fouls by Ameen Tanksley (15 points, 11 rebounds) and Marvin Jordan (nine points) and five quick points from Armand put Iona back in front.
Mason responded with a baseline drive that produced a 3-point play and gave Niagara an 88-86 lead. David Laury, the 6-foot-8 junior college transfer who led Iona with 24 points and 16 rebounds, made two free throws after rebounding a missed 3-pointer by Momo Jones (23 points). Mason came back with another inside bucket to put Niagara in front, but Laury made another pair of foul shots to tie the game at 90 with 21 seconds left.