Lindsay had to leave the island because she "lost" the race! But she was still ahead of Owen and Duncan! She didn't lose! So why did she have to leave??

I dont get it either. Or the fact the if you lose the race for invincibility, you get voted off Also, what is the point of invincibility if you dont use it?

Chris probably could have kicked out Owen for being the first one to wreck, or Duncan because his body never crossed the line. (Owen flew over the line, but most of his bike didn't.) However, Chris wants to add as much drama to the show as possible. He tried to break up the alliance, and a fight broke out, which was pretty awesome. Chris doesn't really care about strict interpretation of the rules. He let Harold get away with cheating so he could boost the ratings of his show.