Read "Unwise Child" by Randall Garrett online for free on Textopian. Full text with search, annotations, highlights, and AI-powered reading aids.
The kids who tried to jump Mike the Angel were bright enough in a lot of ways, but they made a bad mistake when they tangled with Mike the Angel.
They'd done their preliminary work well enough. They had cased the job thoroughly, and they had built the equipment to take care of it. Their mistake was not in their planning; it was in not taking Mike the Angel into account.