LeftTuple rtnLeftTuple = ( LeftTuple ) leftTuple.getObject();
LeftTuple mainLeftTuple = leftTuple.getFirstChild();
if ( rtnLeftTuple != null ) {
RuleTerminalNode rtn = ( RuleTerminalNode ) rtnLeftTuple.getSink();
rtn.retractLeftTuple( rtnLeftTuple, rtnLeftTuple.getPropagationContext(), wm );
}
if ( mainLeftTuple != null ) {
switch ( mainLeftTuple.getStagedType() ) {
// handle clash with already staged entries