They figure it out once they realize what the point is. In real hunting situations on upland birds with a pair of flushing dogs, there is usually a really long walk where it's quiet, and then just a sudden unexpected flurry and boom. Sometimes they see it go down, and sometimes they don't but they are excited that ~something~ happened!
For a long time we were all new, the dogs and I, and I would try but couldn't hit any birds. They got to where they thought flushing them and boom and watching them all fly away ~was~ the whole game. ;~D
I used to be able to break in the high 80s/low 90s, but I'm a bit out of shape.
She also points, BTW.