Remember Charlie from Lost....?

from the show Lost i mean. Im watching season 3 on dvd (i know i'm really late) and in the episode "greatest hits" he's talking about being a good swimmer and holding his breath for four minutes and whatever, but wasn't there an episode where he said he cant swim?? im pretty sure it was the first season, it was when someone was drowning and jack swam in to rescue her, but he saved boone instead. remember that episode? wasn't it charlie who was screaming for jack to help? and he said he would go in after her, but he cant swim? was it someone else or am i crazy or what? because that's what i remember,,,,,,,