I'm just glad he didn't cut off his leg. I did not want to see Jack torture Boone to death by trying to save him.
A small nitpick: Urchin spines are not hollow and you don't want to stick yourself with one, you will get an infection from the tissue on them. One urchin researcher I used to work with got so sensitive to them that he would get rashes on his knees through the holes in his wetsuit while diving from just touching them. Tropical ones are even worse in that respect than the temperate ones I deal with.
