Toz and Asilean used one of the docks as a springboard to leap out of the city's gravity and protective barrier. Their actions would have attracted the attention of the people nearby if Toz hadn't used a combination of darkness and void magic to conceal their presence. However, since it was his first time traveling through the Void directly, Toz didn't dare play around with combination magic, so he stuck only to using void magic.
Toz and Asilean used void magic to push themselves through the Void while using space magic to shrink the distance, and they disappeared from sight in a few moments. However, there were still several people who saw Toz enter the Void with nothing but the clothes on him. And unless made from priceless treasure, clothes couldn't withstand the burden of the necessary enchantments to protect their wearer from the Void.