The battle occurs as a result of Roman's attempt to rob From Dust Till Dawn. One of the henchmen spots Ruby who, due to both her hood and headphones being on, was unaware the store she was shopping in was being held up. The fight initiates when the henchman gets Ruby's attention.
As Roman is waiting for his men to finish the heist, some noise from the back of the store is heard; a henchman then flies across the room, crashing into the wall. Roman motions for another henchman to deal with the problem.
A henchman runs up to Ruby, aiming at her with his gun and ordering her to freeze. Ruby tackles him, sending them flying across the shop and out through the front window. Roman and the remaining henchmen look outside to see Ruby standing up, unfolding Crescent Rose into its scythe form. Ruby smiles at them before twirling her weapon around, striking it into the ground.
Roman looks at her in surprise, then orders his men to deal with her. The henchmen run out to the front of the shop and charge at Ruby, who spins around her scythe and kicks the closest assailant in the face.
She then pulls Crescent Rose out of the ground and fires a shot, using the recoil to slam the butt of her weapon into the next henchman, sending him flying, before bringing it down on another after following through the motion. The final attacker opens fire on her, forcing her to evade the incoming rounds through a series of zigzags, propelled by a few shots from Crescent Rose. This allows her to get close enough to knock him into the air. She then spins around and knocks him down, with the henchman landing at Roman's feet.
After commenting on the uselessness of the henchmen, Roman tells Ruby that this is where they part ways. He then takes aim at her with Melodic Cudgel and fires a shot - one that she quickly dodges by jumping onto Crescent Rose and launching herself upwards. When she lands, she looks around, spotting Roman just in time to see him fleeing the scene up a ladder. She quickly checks that the shopkeeper is okay and asks for permission to go after Roman. The shopkeeper nods, and Ruby gives chase.