Apparently she didn't dumb it down enough. Beatrix resisted the urge to look at Zoro cross-eyed as if that would make him seem less... stupid. Maybe he's just from a third world nation or something that doesn't have modern technology. In fact, it looked like he was going to pop a blood vessel in his brain if his face stayed that way much longer and then... suddenly he got the very, very, very bare basics of the concept.

And then he opened his mouth some more. Where the hell was this guy from and did he honestly think like this?

"No, it doesn't use a column of water to shoot it into the air," she stated, barely concealing her sudden sense of having lost a few IQ points for even answering the man. "Some small planes can take off from the water but they just float on it like a boat does until they get up to the right speed and then just soar into the air sans column of water. The majority of planes drive really fast. like a car, on a runway to get up to the right speed before lifting into the air."