Once the ball has gone ten yards and touched the ground, there is no "first touching" of a free kick, as the ball belongs to anyone who possesses it. But simply putting your foot on it is not possessing it (and it's damn poor coaching). What you have is a live ball IF someone is attempting to recover it. If both teams are walking away, you have a ball at rest with no one attempting to possess it. Blow it dead, it belongs to R at that spot.