Write a captivating news report on the recent escape of 28-year-old inmate Sedrick T. Stevenson from Seattle-Tacoma International Airport. Outline the details of the incident, including how he managed to evade custody and board a light rail train to Capitol Hill, and discuss the potential implications this escape may have on airport security protocols moving forward. Be sure to incorporate insights from the Port of Seattle Police Department and any relevant background information on the inmate.