When did Luka transform for the first time?

So in which episode did he transform himself for the first time. I'm asking the question because I don't think he did that in "Party Crasher" episode 11 of season 4 (Netflix). Did i skip something? (The same goes for Max 🤷🏻♀️)

Yes the result was confusing but the episode you are looking for is called Desperade.