When Garratt is playing in roller derby games , she sheds her everyday demeanour .
When Garratt is playing in roller derby games , she becomes Preacher 's Slaughter , one of the newest members of Canada 's national roller derby team .
When Garratt is playing in roller derby games , she sheds her everyday demeanour and becomes Preacher 's Slaughter , one of the newest members of Canada 's national roller derby team .