Tragedy or disaster can be like a flash of lightning, illuminating human nature in the raw, all unprepared. The sight suddenly revealed can be profoundly shocking, as in the behaviour of the captain of the South Korean ferry who failed, when it started to sink, to put the interests of its young passengers before his own. Or it can be moving, uplifting and inspiring. Nothing can have prepared Corpus Christi Catholic College in Leeds for the sudden trauma it suffered on Monday when one of its most loved and respected teachers was stabbed to death in front of a class of 30 teenagers. But this time human nature has been revealed at its best as well as its worst. Shocks like this really test an institution’s strengths. Corpus Christi College serves the local Catholic community in Leeds o