by Scorpion0x17
Correct, and correct.And, further to the second question, you'll find this in several of the scenarios, that the win conditions mean that the game may end abruptly when one player achieves one thing (for example on has the win condition of "get one survivor to red" (or words to that effect)).
You can play these scenarios as written, if you wish. However, one of the things I most like about Zombicide is how customisable it is, and there's nothing stopping you adding an "all survivors must make it to the exit" win condition (though in some cases that will require you to add an exit to the scenario map).