According to a POH found online the gross weight climb at 4,500' density altitude would be a bit under 400'/min yielding a climb gradient of about 270'/mile at 89 mph cas, subject to actual loading, leaning, temperature and wind. How much terrain clearance would he have over the next 4 miles climbing straight out to 1,000' over runway elevation before turning?
The preliminary report notes a moonless night. It would be interesting to hear from local pilots of similar aircraft how they handle departures.