Building a responsive site for a big consumer brand, and we're using a hamburger slideout menu from the right. This slideout will move the content off screen to the left, rather than sliding out over the page content.

I'm designing the hamburger menu to change to a directional arrow facing back to the right, but people on the team feel that it should face to the left, indicating that the user's view will slide back to the content. 

Is there a convention here?