Luki barely had time to react to the red figure jumping into the middle of the one-sided battle right after the warning shot, her eyes shooting up once more and opening her mouth to gasp- half a second before she felt Vash's smack, taking a startled and unpleasantly surprised step back. Staring at him with that very same expression, panting, both arms hanging in front of her legs as she slouched slightly again, she watched briefly while Vash's eyes turned back at his partner, silently signaling something to the man with the sword.
Surprise quickly worn off, however, and soon she was lunging forwards once more, screaming, this time with rage and added frustration in her tone. Jumping and taking a somersault above their heads, her sleeves flew behind her and had a whip-effect the moment she landed immediately behind Cloud, fighting to keep up straight with the impact. She would give little to no room to any possible reaction from Cloud as she turned around and swung her blades against him.