Riis met a cross from Brad Potts flush on the volley and found the net to earn a point.
It was the second time Riis had equalised in the game, the Robins having taken the lead first through Chris Martin and then Antonie Semenyo.
Here are the player ratings from the Championship clash, with Riis pick of the bunch.
Here are the player ratings from the Championship clash, with Riis pick of the bunch.
2 / 4