John Legend may have saved the best for last!Two «phenomenal talents» from Team John take the stage on Tuesday's episode for a head-to-head battle that leaves the coaches' jaws on the floor.Cami Clune, a 20-year-old musical theater student, is up first, delivering a hauntingly spare rendition of «I Put a Spell on You» by Screamin' Jay Hawkins that has Kelly Clarkson up out of her seat almost immediately.«I feel like you get better and better and I am so impressed by you,» raves Kelly, who