Depends how good the player is! Although you're describing proper technique, it's certainly possible to toe poke it with the standing foot a distance behind the ball.Surely if you're kicking the ball backwards, you're inherently in your own half - or rather on the line - when it's kicked. One foot will be next the ball and one foot will be kicking it. In theory, you could take a 15 yard run-up from within the opponent's half and still be on the half-way line at the moment the ball is kicked. I'm obviously not suggesting anyone would allow that, but it's how the wording could be read at its logical extreme...