Strange Play

[504BB]

SIT: Team A trailing 60/59, one second left in fourth Q, A1 inbounds to A2 in backcourt, A2 heaves desperation shot from about 75'. Shot leaves hands before buzzer. B1 standing in the lane sees the shot is short of the basket and jumps to grab it. The ball bounces off his hands and into the basket. Time expired before the contact with B1.

The officials confered and ruled the basket good, citing the case play that states that a shot deflected by defense after time expires should be counted.

Did they get this right? I believe the shot ended when the ball fell below the rim and the only other call would have been goaltending if the ball still had a chance to go in.

Please advise.