Ryan reached the ground, training and instinct sending his body into full alert, his senses testing every turn of the foul breeze, cataloging every possible vantage point from the nearby buildings where a sniper could find an attack position, infrared vision scanning for heat signatures in places where there shouldn't be any. His hearing automatically tuned out the dull background noises that come standard with a bustling airport, searching for that elusive sound, the one that didn't belong, the one that spelled danger.