TRAINEE PLT; WITH INSTRUCTOR; ABORTED TKOF AT A NON TWR ARPT AFTER OBSERVING A C152 FLY OVERHEAD. IT HAD TAKEN OFF FROM THE OPPOSITE END OF THE RWY. THE OTHER END OF THE RWY WAS NOT VISIBLE DUE TO A HUMP IN THE RWY. IN ADDITION; THE OTHER PLT WAS NOT ANNOUNCING HIS INTENTIONS ON UNICOM OR MONITORING RPTR'S CALLS.

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MY ACFT ARRIVED AT CEW VIA ILS RWY 17 APCH WITH EGLIN APCH CTL. WE REMAINED IN VFR TFC PATTERN. ON ARR; ASOS WINDS WERE LIGHT AND FAVORING RWY 17. THERE WERE NO OTHER ACFT IN THE PATTERN OR ON THE CTAF FREQ. ALL PATTERNS I MADE WERE FULL STOP/TAXI BACK. I CONTINUOUSLY RPTED MY POS IN THE PATTERN ON THE CTAF (122.95). ON TAXI BACK FOR MY LAST PATTERN; I NOTED THAT THE WINDSOCK WAS FAVORING RWY 35 BUT DECIDED TO CONTINUE WITH RWY 17 SINCE WINDS WERE LIGHT AND I WAS DEPARTING THE PATTERN. ON TKOF ROLL AT APPROX 60 KTS I SAW A LIGHT ACFT ABOVE ME THAT HAD APPARENTLY DEPARTED USING RWY 35. MY STUDENT ABORTED THE TKOF AND WE CLRED THE RWY AT MIDFIELD. WE HAD BEEN UNABLE TO SEE THE OTHER ACFT ON THE RWY DUE TO THE SLOPE OF THE TERRAIN. NO RADIO CALL WAS HEARD ON CTAF FROM THE OTHER ACFT. I DID HEAR A MIL ACFT CALL APCHING FOR RWY 35 SO I USED RWY 35 FOR THE SUBSEQUENT DEP. MYSELF AND THE OTHER PLT COULD HAVE BOTH DONE THINGS TO PREVENT THIS INCIDENT. I COULD HAVE RECHKED THE ASOS BROADCAST PERIODICALLY AND PERHAPS WOULD HAVE SWITCHED RWYS SOONER DUE TO CHANGING CONDITIONS. THE OTHER ACFT SHOULD HAVE CONTINUOUSLY MONITORED THE CTAF FREQ AND RPTED HIS INTENTIONS OVER HIS RADIO. THE FACT THAT THE RWY SLOPES DOWNWARD FROM THE CTR ONLY MAKES IT MORE IMPORTANT THAT PLTS COMMUNICATE PROPERLY.