Lukas didn't expect that they'd travel for more than two weeks to reach the City of Nyx.
It was clear that the Vampire settlements were truly far from each other–it was only that the Veil Forest existed close enough to Lux.
In the span of time that occurred while they were traveling, Lukas was able to observe some things.
The initial and most obvious was the hostility between the members in the group.
When Alexei and Lukas first encountered each other, Lukas nearly had gotten mugged out of the Blood Water that he obtained. Alexei was also sharp-tongued and brutal during their meeting for the departure to Lux.
It was probably because of the danger involved that made Alexei rather hotheaded and unwilling to cooperate. However, as time passed, it became clearer that it was mostly a front and Alexei was actually charismatic when given the chance.