Thankfully Madoka is distracted by the other things Piccolo says before she can start on a very, very awkward explanation of alien probing. But then again, is it really that thankful, considering the exact part that distracts her? Of course it's the part about her being too nice and therefore vulnerable, after all.

It makes her gaze drop, visibly looking sad. She's not even upset with Piccolo, because she knows he's right. She really is vulnerable. (And weak, she adds in her mind.) It's no surprise that that's obvious to other people as well.

"I'm sorry if I worry you, mister Piccolo.."