PLT OF C172 REPORTS NMAC AT UNCONTROLLED I73.

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DURING UPWIND CLB FROM RWY 26 AT I73; I OBSERVED A BEECH BARON PASS AT 4 O'CLOCK POS LOW; APPROX 100 FT BELOW AND WITHIN 300 FT OF MY C172. I IMMEDIATELY XMITTED 'BEECH BARON IN VICINITY OF MORAINE; WHAT ARE YOUR INTENTIONS?' THE PLT RESPONDED; 'I AM ENTERING DOWNWIND FOR LNDG RWY 26.' I THEN ASKED; 'BARON; DID YOU OBSERVE THE CESSNA ON UPWIND?' THE PLT RESPONDED; 'AFFIRMATIVE; HAD YOU IN SIGHT; THOUGHT YOU WERE HIGH.' AT THIS POINT I JUDGED THAT I HAD ENCOUNTERED AN INSANE INDIVIDUAL. THIS PERSON 'ENTERED' A TFC PATTERN OCCUPIED BY 2 C172'S AND A C140; OPERATING A HIGH-PERFORMANCE PISTON TWIN; AT 500 FT AGL; ON A HDG OF; ROUGHLY; 100 DEGS; DIRECTLY OVER THE FIELD. AFTER COMPLETING MY LNDG PRACTICE AND BEING RELATIVELY NEW TO THIS AREA; I SOUGHT THE ADVICE OF A LCL PLT. HE STATED THAT A FACE-TO-FACE CONFRONTATION WITH THE OPERATOR OF THE BARON WOULD BE FRUITLESS AS 'HE PRETTY MUCH JUST DOES WHATEVER HE FEELS LIKE DOING AND A VERBAL CONFRONTATION WOULD LIKELY ESCALATE TO A PHYSICAL ONE.'