/**
* Check if the message is a -1. If we *just* got a message with the
* values filled, discard it, otherwise perform right-click-air.
*/
if (message.getDirection() == -1) {
BlockPlacementMessage previous = session.getPreviousPlacement();
if (previous == null || !previous.getHeldItem().equals(message.getHeldItem())) {
// perform normal right-click-air actions
action = Action.RIGHT_CLICK_AIR;
clicked = null;
} else {
// terminate processing of this event