Evrina may be crass & unruly, but she does have a plan. This kind of stuff happens in Shokugeki No Soma (Food Wars) all the time. They bring out a dish & it seems kind of pedestrian, but then the secret thing is revealed. The comic is always explaining food things in very complex ways & my brain basically tunes it out. It’s the same as any competition manga. There’s the thing you do, the opponent scoffs, THEN YOU ACTIVATE YOUR TRAP CARD! It’s a formula that works.