Well, a District 3 boy is seen guarding the camp in the scene where Katniss shoots the apples, but Peeta Mellark is the first tribute from a different district to be allowed into the Career pack. It is later revealed that Peeta never trusted or liked the Career tributes, and clearly only joined the Careers to stay alive.
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Katniss and Peeta were going to break off the alliance the night the careers came to get them
Cato was the last one to survive.
Katniss wants to split from the alliance because she eventually later on when all the other tributes are dead she and Peeta will have to kill all the tribute they made alliances with.So in my opinion that is a good idea.
The bloodbath is a nickname the fight at the start of the games are give. For example; Most tributes will run and try to get a weapon, supplies, water, food, etc and this is where the careers come in. The careers are from D1, D2 and D4 and are the strongest of the tributes as they've been trained illegally in their district from a young age, yet they get away with it. The careers will most often all become allies and pick of tribute by tribute and then when the careers are the last ones left, turn on each other which makes a great fight. At the bloodbath the careers will race in, grab their preferred weapons and take anyone out that ran towards the cornucopia, then the careers will gather the supplies and make a base camp. It is called the bloodbath because the careers usually kill around half of the tributes.
Because the tribute starts a fire in the middle of the night. The flames could attract the Careers or any other blood thirsty tribute