Show, don't tell. The author also broke that rule in Panel 5 with "sex change occurs sounds" written off to the side. We see the 𝓶𝓪𝓰𝓲𝓬 𝓫𝓾𝓫𝓫𝓵𝓮. Clearly, that means the sex change occurred in the context of the setup. We get it, dude.