When Serpent Boss was dealing with Gridhacker's tracing beams, Ronald never stopped moving because he knew an unseen sniper was around. He wanted to retreat to where the other World Ruler's members were fighting but he was harassed by Serpent Boss' Abyss fox.
The Abyss Fox had the flash step ability. When Ronald shot at it, it shifted its position and dodge the bullets. When it got near, it suddenly turned into a shadow and zoomed with incredible speed. This was its offensive skill, Dark Rush.
Ronald's reflex allowed him to move to the side, but the abyss fox still scratched him as it passed by, inflicting dark damage.
Ronald threw his smoke grenade to the ground and created smoke that obscured him from the enemy's view. Several gunshot sounds were heard. The abyss fox used Flash Step again to dodge, but it was hit after he completed the flash step. Ronald had made predictions about the direction the abyss fox was dodging.