Puzzle - Holdson - Wasgij? - 1000pc Puzzle - Original #49

It's the grand opening of the local Padel club and the first match is in full swing! The crowd is cheering the balloons are bobbing and the players are ready to put on a show. Whilst one player is making a shot of a lifetime something is leaving the other players and spectators in shock...

Try to imagine what the players have seen that has caused their jaws to drop. That is the image you need to puzzle!