Tug: Okay, let's see... the most interesting thing that happened to me this year... hmm... I have to... Oh! I know, I know, I know, listen to this: I'd say it was when I finally knocked down that tree that was blocking the view from my cave. Now I got a family of chipmunks staying at my place.
Singer: Great Spirits of all who lived before/ Take our hands and lead us/ Fill our hearts and souls with all you know/ Show us that in your eyes/ we are all the same/ Brothers to each other/ In this world we remain/ truly brothers all the same.
Tuke: How's it going, bear?
Kenai: Don't call me that.
Tuke: Sorry, um... Mister Bear?
Tanana: I don't speak "bear."
Rutt: Hey, don't go near this patch here, eh. Something went in here.
Koda: When I get in a fight, I go all crazy, and I'm a raging ball of brown fur.
Tanana: You left too soon, Sitka. Your brothers need your guidance.
Koda: ...my eyes were watering, and my tongue was swollen, and from that moment on, I was more careful about what I lick.
Tug: Hey, don't throw your fish bones over here! Someone could choke on that.
Rutt: Hey, you know what this calls for? A pile of delicious barley and amber wheat on a cool bed of malted hops, eh.
Tuke: I like it.
Mabel: This year, I lost my dear husband, Edgar.
Edgar: Quit tellin' everyone I'm dead.
Koda: Oh, that reminds me! Last year at the Salmon Run, my friend Bucky totally dared me, but I'd heard about this other cub who stuck HIS tongue to an iceberg, and then he started to float away, and so to save him, they had to like rip off his tongue, and so, now he hath to tog like thith all a time.
Kenai: Koda... your mother's not coming back.
Kenai: Okay, okay, Heh... Koda... I, uh... I... I gotta get goin'.
Koda: Well, when you come back, we can go.
Kenai: I... I won't be coming back.
Koda: What? Why not?
Kenai: Because... well... it's hard to explai.
Tug: You're leaving?
Kenai: GAH! UH, no! Well I, uh... I mean yes. Uh... well it's just that I... I don't... I don't belong here.
Tug: "Don't belong"? every bear belongs here.
Kenai: Keep all that cuddly bear stuff to a minimum, okay, kid?
Young Goose: Are we there yet?
Goose: Don't make me turn this formation around.
Answer: The bear injures Sitka right before he sacrifices himself. We don't see the injury itself due to the film wanting to keep its G rating, but we do see the bear attack and most likely maul Sitka, heavily implying his injuries are fatal. This is why he's hunched over and breathing heavily when we next see him as the bear is moving towards Kenai and Denahi.