DUMBLEDORE: And now our friends from the north. Please greet the proud sons of Durmstrang and their high master, Igor Karkaroff.
Dumbledore gets the Triwizard Tournament off to an extremely friendly start, introducing the headmaster and headmistress of their rival schools super warmly. You'd never guess they'd be sending kids to compete in super dangerous tasks.
HARRY: Someone's coming.
SIRIUS: Keep your friends close, Harry.
This is pretty timely advice from Sirius, given that Harry and Ron have been in a very silly fight about nothing. With people putting Harry's name in the Goblet of Fire and other weird stuff afoot, Harry might want to clear things up with the people he has traditionally trusted most.
RON: I reckon you'd have to be barking mad to put your own name in the Goblet of Fire.
HARRY: Caught on, have you? Took you long enough.
RON: I wasn't the only one who thought you'd done it. Everyone was saying it behind your back.
HARRY: Brilliant. That makes me feel loads better.
Finally, Ron has figured out that Harry did not try to cheat to get into the Triwizard Tournament. Sure, Harry is mad that he didn't realize/admit that fact in the first place, but it's all good: at least these two have made up so Harry can focus on real enemies.
HARRY: But she's my friend too!
MERPERSON: Only one!
The second task in the Triwizard Tournament asks the champions to rescue "treasure" from the bottom of the lake. What treasure, you ask? Naturally, we're not talking like pearls or iPhones. Nope, the treasure consists of people—the folks who are nearest and dearest to the champions.
When Harry gets down to the bottom, he finds that both Ron and Hermione are there and, since they are both his friends, he tries to save them both. Apparently this is the wrong move, though, since Hermione is meant for Krum. So, Harry has to leave her for Krum to take back to shore.
HERMIONE: Viktor's gone to go and get drinks. Would you care to join us?
RON: No, we'd not care to join you and Viktor.
HERMIONE: What's got your wand in a knot?
RON: He's a Durmstrang. You're fraternizing with the enemy.
HERMIONE: The enemy? Who was it wanting his autograph? Besides, the whole point of the tournament is international magical cooperation. To make friends.
Hermione is still totally into the whole making new friends aspect of the tournament, but Ron isn't having any of it (especially now that Viktor Krum and Hermione are dating). But of course, that's probably because Ron's more than a little bit jealous of Viktor and Hermione's love thing. Hmm, could he want to be more than just friends with her?
VOLDEMORT: Welcome, my friends. Thirteen years it's been, and yet, here you stand before me as though it were only yesterday. I confess myself disappointed. Not one of you tried to find me. Crabbe! Macnair! Goyle! Not even you, Lucius.
Voldemort's Death Eater friends aren't super-loyal or reliable. Color us shocked. As a result, the Dark Lord is pretty angry.
DUMBLEDORE: In light of recent events, the bonds of friendship we've made this year will be more important than ever. Remember that, and Cedric Diggory will not have died in vain. You remember that, and we'll celebrate a boy who was kind and honest, and brave and true, right to the very end.
See, that's exactly what Sirius was saying: when stuff gets dangerous, you pull the friends who can trust closer. Harry and his friends don't really have time or space for a lot of teen angst if it's going to push them apart, since they will need all their strength to deal with Voldy being back.
DUMBLEDORE: Cedric Diggory was, as you all know, exceptionally hard-working, infinitely fair-minded, and, most importantly a fierce, fierce friend.
Sniff. It's true: Cedric was a good friend. He made sure that he didn't have any unfair advantages in the tournament, and he stuck up for Harry/told his friends to stop wearing "Potter Stinks!" buttons when everyone in the school thought Harry had cheated. He was definitely a good guy who took his friends/fellow students seriously.
DUMBLEDORE: Dark and difficult times lie ahead. Soon we must all face the choice between what is right and what is easy. But remember this: You have friends here. You're not alone.
Hogwarts is like the Cheers! of the wizarding world: Here, everybody knows your name. What does that mean in this context? Well, simply that this is a safe place where people care about you. Something tells us that Hogwarts is going to be a pretty important safe-haven as Voldemort gets more active with his evil plans.