Chapter 14 Mission 1 Nightmare

So I was playing this Mission on nightmare and I had already opened the first 2 car trunks glowing white and ended my turn. A new turn began, and all three of my survivors had full AP. I used one survivor to open the trunk, and my turn automatically ended, and walkers emerged killing my survivors. Is the automatic turn end something that's supposed to happen?
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Sorry, and good luck.
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