I think Jon is correct that the barrier is on the shooter side of the pigeon trap/launch/throw.

BTW one the of best turn-of-the-century Live Bird shooters was Donald Mackintosh (correct spelling) of Australia - scroll down a bit to the 1900 Olympic Games
https://docs.google.com/document/d/185YOyQl7GIB9OYLs9Hr3tnMLHqs4rjEdR4j_E9l4HLw/edit