Standing at the bow, even though Lord of Matu City wore Void Magic Armor and was separated from Rocky by a Defensive Net, he still felt uneasy.
This unease was not so much about whether Rocky could really hurt him, but more about Matu's own lack of confidence.
As a City Lord himself, he paled in comparison to Rocky; this was evident from the comparative strength of their respective aerial cities. Rocky's Sky City had a population of barely two thousand, yet he had already established a formidable fleet. The city's development was well-organized, and everything was thriving. Thus, he was able to defeat Baron Wolin, whose strength was slightly superior.
While Matu's Sky City had a population of three thousand, it was inferior in every aspect to Thunderhawk City, especially in military strength. Even though Rocky's fleet had just been through a major battle, it was still stronger than Matu's fleet.