Cole had been keeping tabs on Emma and Sarah despite barely contacting them and finding it hard to face them and knew of most of what they were doing, while he had also stationed somebody to monitor and protect them at all times.
Despite being on bad terms with them, he still cared for them deeply, especially Emma who was once his lover and stood with him through thick and thin.
Adam could tell how Cole was thinking and feeling and began by relaxing and joking around with Cole in the back of the taxi.
Cole could have used his Wind Elemental Affinity to get them both to fly over the city and the speeds they would move at in the air would make them seem to merely be a blur, and even if they were seen, most ordinary people wouldn't believe their own eyes.