He was pointing in the past and is now just taking birds out/bumping?
Forgive me for asking, but are you or have you been shooting birds that he's handled incorrectly?
Quickest way to turn a pointer into a flusher is to shoot birds that are intentionally bumped/flushed.
He quickly learns that he gets the bird if he just goes in and takes the bird out.*
If you're not... then more info.