ContextEntry[] contextEntry = bm.getContext();
BetaConstraints constraints = existsNode.getRawConstraints();
FastIterator it = existsNode.getRightIterator( rtm );
for ( RightTuple rightTuple = srcRightTuples.getDeleteFirst(); rightTuple != null; ) {
RightTuple next = rightTuple.getStagedNext();
rtm.remove( rightTuple );
rightTuple.setMemory( null );
final RightTuple rootBlocker = (RightTuple) it.next(rightTuple);
if ( rightTuple.getBlocked() == null ) {
return;
}