Stuff they don't teach in Risk Management Class
Pretend for a moment that you've been sent to pull a sailboat that is stranded on a very notorious rocky reef (I won't say where - it doesn't matter to the story here). Lets say the sailboat looks just like this one here.
....and lets say that you get your tow line all nicely hooked up, and you begin to pull......maybe you pull a little harder.....she's almost off.....
.....just a few more RPMs should do it.....
and then you hear a very bad sound...
If you click on the photo, you should see a larger version. This captain managed to get the job completed after a little more drama - he got his one of his wheels wrapped in a lobster pot. Just one of those days I guess....