MOO he knew of and really liked the flat place they were found.
Since I believe he is a local young man, I think he had a geeky epiphany at some point that the flat could not be seen from bridge, but he could see the bridge, like a hunting blind. Then he also noted prevailing afternoon winds come from the west, carrying sound away to the east. He is now not just hiding in plain sight, MOO he also murdered in plain sight.
MOO MOO Look for someone with a well to do background that offsets his social deficits. Too tightly wound, who has difficulty being natural, someone people are made uneasy by. Someone with off sense of humor, a startling or strange quickness in retorts or movements. Someone who never really connects, but really wants friends and approval. Someone who would kill over being passed over, rejected for a date or being excluded.