Amy epitomizes what is broken about the character switching mechanic in the 3DS Sonic Booms. There is no reason for the Amy-hammer-pillars to exist except as a contrived method to get you to switch to Amy, just so you can remove the pillars, before carrying on as you normally were. These might as well be replaced with signposts that automatically turn you into Amy when touched. Their existence would be no less inane, but at least it wouldn't interrupt the gameplay.