Derek Bartlett never set out to be a ghost hunter. While legends of New England ghosts and the paranormal were a personal fascination, the retired U.S. Marine Corps reconnaissance sniper was a corporate manager, a regular 9 to 5’er like most anyone else. A single picture changed all of that. On Thursday, October 27, Bartlett presented “Dangers of the Paranormal” at Temple University Ambler, providing an insider’s view of the potential pitfalls of opening doors to the otherworldly or investigating what’s already come across into this world.