Naw I totally agree that it was a bad choice for Luka to go in alone. I think the issue here is that Luka most likely has memories of the og timeline. Therefore he thinks that he is the capable adult that he was in the og timeline. So he arrogantly believes that he can save her himself because he's shown independence before. Plus if you put it in a child's pov he most likely worried about his aunt and acted impulsively. ┑(￣Д ￣)┍
It was probably for stealth reasons and knowing that Ruediger (and any other reasonable adult who would know that Luca shouldn’t know the slums at this point in time) wouldn’t let him go
He probably left to make sure Judith could escape or get a chance to before anything happened and left a note on how to find him, since they definitely would look for him lol
I may be a few chapters late but what i don't like is why did Luca come to rescue her alone, why didn't he bring any guards with him, or at least the ML, i mean what could he do in a childs body, and what was taking the guards so long to come i assume Luca told them the location, so why let him go alone, ok maybe it's to avoid dettection, but as i sead it why not take someone else with him, i dont think it would be too suspicious to see an adult and a child together, but that's just my opinion you can ignore it if you want ╮(￣▽￣)╭