I had an incident in my match last night - free kick just outside the "D" to a team a goal down in the dying seconds of a tight game. Obviously, I'm right on top of this to manage it ceremonially, including telling the player lining up to take the FK that it would be on the whistle. I walk the wall back and have taken maybe a single step towards taking my position when the kicker runs up and takes a shot. My instinct at this point was to quickly blow the whistle a few times to order a retake, but the keeper had made a save and gathered the ball. I decided that the correct thing to do was probably to go ahead with the retake, but it did feel like I was giving the attacker a second go - is there any case for playing on here even though I hadn't whistled to restart play? Or was I obliged to let him try again?