I know I drew a similar image of Volker getting punched before, but I wanted another try at it to work on my impacts for fight scenes. Could probably still use some more work, but I think it's at least better than my previous attempt.
For Otto and Auda, Lubo is referring to when Volker attacked Otto and made Auda worry and be frustrated. As for his parents, well he insulted them and their death is the reason Lubo is fighting crooks in the first place.
バー(baa) ド―(doo) ガシン(gashin) are all impacts of various degrees of severity.
Batuu: Ugh, c'mon Volker =w=