Free throw disconcertion

[Damian]

This happened last night as I watched a varsity game. Team A the home team made a run from behind to get a one point lead with seconds left. Team B takes the ball down, takes a last second shot, misses, but an A player fouls on the rebound before time expires. With 0:00 on clock, Team B takes a 1 and 1. No one on the lane. Player B makes the first one. Game tied.

After the player gets the ball for second shot, a fan gets on base line under basket waving his jacket wildly to distract the shooter. The officals gives the hold clock signal. The player misses. The offical call disconcertion and gives him another shot. He makes it and wins the game. Police escort required.

Should the ref have gotten the ball back, removed the fan, then proceeded, call a disconcertion, or do nothing and go into overtime?