Original: As soon as they arrive , Knuckles ambushes Sonic from underground with such force , he knocks the Chaos Emeralds from him , returning him to normal . Stunned , Sonic can only watch as Knuckles steals the Emeralds and disappears inland .
Simplified: However , Knuckles surprises them , and takes away the Chaos Emeralds Sonic and Tails have collected .