Uhm-- This is all very stupid considering you don't even need to kick the shells for them to open, they open by themselfs, and kicking them doesn't get you pearls any faster (from personal experience). It's all just timing and paitence, who ever gets to the pearl first gets it, you can't steal them because noone owns them, if theres someone else? oh well, why not come back another time?
Urizen
