Ned rescues a younger kid from a mob of other younger kids at the beginning. They've been doing some Xmas-themed bullying, wrapping him in lights, poking him with oversized candy canes.
The kids are exaggeratedly tiny compared to Ned.
After Ned releases the victim, they sing a song to Ned with the lyrics:
Don't blame us - we don't know any better - we're too young to know right and wrong...
When we're alone we feel weak and tiny. When we're together we're tough and strong..
The last notes of the kids' song are the rising tones of Bach's Toccata and Fugue in D minor. But it doesn't resolve into the last chord. They don't stop singing the notes the whole time they chase Ned to the school. Their voices shake with the impact of their running. ("Str-oOoOoOoOoOoNnNnNg")
The kid Ned releases turns out to be the Indian kid at the end - the leader of the grays.