Kinda hard but more of an annoyance 5 star. Perfection is required as being hit or whiffing attacks can cause you to lose your combo, also DO NOT hit shields repeatedly! if a riot shielders shield goes red it'll break your combo. Use heavy attacks/bass invader to break them up close, or use thunderstruck if theres a group of enemies. Use thunderstruck a lot to help max points, and do use fever rush but be careful as it will lock onto riot shielders and does not break shields. Somewhat hard 5 star.