I saw how one died and then a team member got on the blue bus and was able to get it back
Because it's a game, you don't die there forever like in real life.
I saw someone die
Maybe he was just dead and could be resuscitated?
The bus is a spawn bus. If your teammate steals, he leaves a card that you have to collect within a minute, I think. Then you will be shown on the whole map where the buses are, with which you can bring your member back.
In teammatch you have to collect all three cards if all three members go on it. On the bus you will be able to spawn all three members back.
So if you play duo or team with fill up and die in the game, so are really dead where your mate can't revive you at all, you have to wait before you go because at this time you have a map where you can collect. And when your mate comes and picks it up, he will hopefully bring you back and you can continue playing. Unfortunately, after spawning you only have one gray postole and 100 wood. Then you have to hurry to get everything back.