AN INTRUDING SMA LANDED OVER THE TOP OF THE RPTING SMA AT AN UNCTLED ARPT.

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I DEPARTED PWK WITH A STUDENT TO PRACTICE SHORT FIELD LNDGS AT C89. WE HAD ENTERED L DOWNWIND FOR RWY 8; MAKING THE APPROPRIATE RADIO CALLS ON CTAF; AND SAW A BLUE SMA 2 AT OUR ALT. SINCE HE WAS ON THE S SIDE OF THE ARPT; IT WAS NOT OBVIOUS THAT HE INTENDED TO LAND THERE; AS A R- HAND PATTERN WAS NOT SPECIFIED EITHER IN THE ARPT FACILITY DIRECTORY OR BY INDICATORS ON THE GND. WE TRIED TO RAISE HIM ON 122.8; BUT HE DIDN'T ANSWER. WE TURNED FINAL AND LANDED ON RWY 8R -- THE PAVED ONE. WE PULLED OFF THE RWY ONTO THE GRASS STRIP TO GIVE THE SMA 2 A CLR SHOT AT THE RWY. AS WE WERE TAXIING BACK FOR ANOTHER TKOF; THE SMA 2; WHO WE THOUGHT WAS GOING TO LAND ON THE PAVED RWY 8R; JOGGED OVER TO 8L; THE GRASS STRIP; AND LANDED OVER US; WHICH SCARED THE HELL OUT OF ME; IF NOT NECESSARILY THE GUY IN THE SMA 2. THE WIND AT THE TIME I WOULD ESTIMATE TO BE 130 AT 8 KTS. I HAD CALLED FSS ABOUT SYLVANIA SEVERAL WKS BEFORE; SINCE I HAD NEVER BEEN THERE BEFORE. IF I HAD IT TO DO OVER AGAIN; I WOULD HAVE TAXIED TO THE END OF THE PAVED RWY RATHER THAN PULL OFF TO THE GRASS; BUT; AGAIN; I THOUGHT I WAS DOING THE OTHER GUY A FAVOR.