Based on this picture by DA user mundschenk85. Not much to say here, it’s the yellow one blowing a a whistle.
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Full size BBcode Copy[img]https://derpicdn.net/img/2018/2/6/1649971/full.png[/img] [url=https://derpibooru.org/images/1649971]View on Derpibooru[/url] - [url=https://frownfactory.deviantart.com/art/Request-Referee-Fluttershy-for-KlaviceGavin-729569581]Original source[/url]
Thumbnailed BBcode Copy[img]https://derpicdn.net/img/2018/2/6/1649971/medium.png[/img] [url=https://derpibooru.org/images/1649971]View on Derpibooru[/url] - [url=https://frownfactory.deviantart.com/art/Request-Referee-Fluttershy-for-KlaviceGavin-729569581]Original source[/url]