A Question ? What's the answer ?

Referee takes a spare whistle out onto the field of play with him. At some stage in the game, he drops it and is picked up by a Red team player. Later in the game, Blue team is attacking, and has an obvious goalscoring chance. The Red team player blows the whistle and the Blue team stop, the ball rolling into the possession of the Red team goalkeeper.
 
What are the next steps the referee takes, assuming he knows who blew the whistle?
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