bonus free throw

[timeout]

Watched a jv high school game yesterday, can't figure out if what the ref's did was correct.
Red in 1 + 1 bonus, but ref's signal 2 shots (double bonus). Red shoots the first free throw and misses, ball is picked up by white (I think). Ref blows whistle and realizes something is amiss. They get together, realize their mistake, and go to the position arrow. Was this the correct procedure?