[Ralph's fair at faces and names, but he never really knew the Twins all that well and thought they were dead, just like he had thought Turbo was. So, at the moment, he still thinks that they're some part of Turbo.

He catches both of them looking at him, and that's the final straw, he wants answers and he wants them before the two of them bolt.

So, Ralph gets off of his seat, walks in the direction of the Twins, and as he's passing them, he grabs the back of their jumpsuit collars and starts hauling them off towards the back hallway where the closets and bathrooms are.

He doesn't want to cause a scene and dragging them elsewhere seems like the best idea for a confrontation in a semi-crowded bar.]