Richard was ridiculously tough actually, that shark was just holding on to his bicep and he didnt even flinch. It was only a little tiny one though.
The big story from that episode though wasnt the shark thing, it was that Jenna (the one who won Amazon) left the show to be with her sick mother. They did the usual - oh are you sure you want to go rubbish and she eventually just left. Then at the end of the show they put up a message on the screen saying that Jenna's mum died from her cancer 8 days after Jenna got back. Pretty touching stuff.