There seems to be a recurring motif of leg injuries in the game.
-- Lee's leg is injured in the car crash
-- Duck runs over Shawn's leg with the tractor
-- David's leg is caught in the bear trap and subsequently chopped off by Lee
-- The St. Johns cut off Mark's legs
-- Danny steps in his own bear trap
-- Omid injures his leg when jumping onto the train
-- A zombie grabs Lee's leg from underneath the grating in the sewer
-- Lee has to free his leg after it falls through the stair
I'm honestly a little surprised the zombie at the end of episode 4 bit Lee's hand and not his leg.
Do you think it's building up to something? Maybe at some point in episode 5 Lee will be forced to sever his own leg after it gets caught or something.