Why trams leaving MediaCityUK always stop twice

When you think a Metrolink tram is departing MediaCityUK, it always stops again before actually leaving. This movement is seen every single time, and here's why it's necessary to the operation of the MediaCity branch on the Eccles Line. = Music used available on SoundCloud at:   / tramographymcr   - Metrolink Insights website: https://www.tramographymcr.co.uk/ =