Who publicly unmasks as ugwugwu? Why is this such a serious offense?

Some of the Christian men beg the egwugwu to retire briefly, so that the women will be allowed to go home. The egwugwu agree. As they are retiring, Enoch boasts arrogantly that they would not dare to touch a Christian. One of the egwugwu strikes Enoch with a cane; Enoch unmasks him. To unmask an egwugwu is considered a terrible sin. The Igbo believe it kills the egwugwu.