@Override
        void fire(final MutationListener listener, final Element element, final Property oldValue, final Object newValue, final Object... vertexPropertyKeyValues) {
            listener.vertexPropertyPropertyRemoved((VertexProperty) element, oldValue);
        }
Represents an action where a {@link Property} is removed from a {@link VertexProperty}.
gremlin-core/src/main/java/org/apache/tinkerpop/gremlin/process/traversal/step/util/event/Event.java