By the time Ferro realized he'd made the wrong choice, heading back towards the tower, there was no one but mercenaries and slavers down at the docks. So in order to get past them, he did the one thing rust-catkin were known for being good at.
He dove into the bay and swam, very aware of the bodies being pushed back and forth along the bottom of the piers as he swam amongst them. A few strokes into his journey, he saw a blue, pulsing light on the wrist control of his suit, and a symbol he hadn't considered since arranging the spell flashed on and off.
Pressing it, he felt something start to crawl up his neck, and he fought his panic until he realized that a bubble of air had formed around his face. The distortions made seeing a little difficult, but after a few thankful breaths, he discovered it wouldn't interfere with his swimming, and so he continued.