Awesome game, but this question has kept me busy since last night.
I played Episode 3 and I was convinced Duck was not actually bitten. Everything, and I mean EVERYTHING, pointed in that direction.
I mean, the whole substory about Duck and his allergy pointed me in that direction:
1. First you learn Clementine and Duck are teasing each other with the bugs.
2. Then you learn Duck found some new bugs.
3. Then he is bitten, but you never see a real bite wound. What I see looks like an allergy reaction.
4. Then the complete irrelevant information that Duck is allergic to bees.
5. Even more information, he eats everything?!
So I assumed Duck ate / tried to eat a bug he found (a bee), and the bastard stung him.
I expected a sidestory where you would find out he was actually not bitten but stung etc. etc....
Uhm.. Nope, he has to die anyway... Bye bye Duck?!
I didn't complete the game yet, but does this come back? I checked the fora, but couldn't really find any info...