There was an action scene like twenty pages into book #1. Come now, don't be silly.
You know, I seem to remember the whole running and screaming and hobo-killing and explosions and shiz. Sure, the kids weren't morphing and battling at that stage, but that's still what you'd call a big fightin' action setpiece. Just as they weren't morphing and biting/slashing at the ending on the Rachel.