RPTING ACFT PASSED SECOND ACFT ON A PRACTICE ILS APCH WHEN IT APPEARED TO BE IN A POS TO EXECUTE A MISSED APCH.

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WHILE I WAS FLYING ILS APCH IN DENTON; DECLARED ARR OUTBOUND AT PINCK IAF FIRST AT 3500 FT AND STARTED OUTBOUND FOR THE ILS APCH WITH PROC TURN. SHORTLY AFTERWARDS; SECOND ACFT PIC DECLARED OVER PINCK IAF OUTBOUND AND RPTED THAT HE HAD US IN SIGHT AND WOULD FOLLOW US. WE TURNED OUTBOUND 2 MINS; COMPLETED THE PROC OUTBOUND. SECOND ACFT CUT US OFF AND EXECUTED PROC TURN EARLY. WE KEPT VISUAL CONTACT WITH SECOND ACFT AHEAD; AND DUE TO DIFFERENT AIRSPDS; CLOSED THE DISTANCE BTWN ACFT. WE SLOWED DOWN AS MUCH AS POSSIBLE WHILE TRACKING LOC AND GS. SECOND ACFT DEVIATED L AND R AND UP AND DOWN VERTLY ON THE APCH; WITH OSCILLATIONS WHICH PROBABLY WOULD HAVE INDICATED FULL NEEDLE DEFLECTION ON THE INSTS. JUST BEFORE MIDDLE MARKER; WE CTRED ON THE APCH COURSE AND PASSED ABEAM THE SECOND ACFT WHEN HE APPEARED TO BE IN A POS TO EXECUTE A MISSED APCH AS HE WAS WELL L OF CTR AND ABOVE GLIDE PATH. WE CONTINUED UNEVENTFULLY TO LAND AS WE NOTIFIED TFC OF OUR INTENTIONS AND HAD VISUAL SEPARATION ON SECOND ACFT. WE RECEIVED A STREAM OF VERBAL ABUSE TOTALLY UNCALLED FOR AND OVER THE CTAF. AFTER LNDG AND TAXIING TO PARKING; PLT OF SECOND ACFT CONTINUED TO UTTER EXPLETIVES AND THEREAFTER BODILY HARM -- PLT EXITED THE SECOND ACFT; CONTINUED HIS TIRADE -- BOTH PHYSICALLY AND ABUSIVELY. WE TRIED TO DIFFUSE THE SIT BUT TO LITTLE AVAIL.