"I don't see how that's-- What does that even mean?" Sorry, Maru, but Piccolo has never seen a movie much less one about aliens. And he doesn't read the news either and he hasn't shifted through all of Kami's memories. He doesn't like the whole 'watch the people constantly' as much as his former other half did. He was more a fighter than a guardian. So he doesn't know the trope from anything else, either.

"I'm asking simply because I know what a vampire can do, and I know Madoka... well, you've met her. She's too nice and that makes her vulnerable." He didn't say it to be insulting but it was Piccolo's way to simply be blunt. His eyes darted to her but quickly away again. Normally he didn't feel bad for being so forward but being mean to Madoka was a low blow even for him. He stood his ground with a straight back though.