I asked this guy this question and this was his response:
"When was this boat used in the show. I dont remember there being a Scarab I used anywhere in the TV show. I asked many other people who watched the show too and they dont remember a Scarab I being used for any stunts in the show?"
Thats because the makers of the show want you to think that the bigger boat is actually doing all the stunts, so with the help of trick photography its not hard at all to achieve the exact scenes they want and delete the ones they don't.