
When you're moving, looking for your next pod, clustering your troops is generally a good idea, to minimize the odds you pull multiple pods, maximizing your entire squad's ability to respond if a pod patrols into them, maximizing the potential Overwatch triggers if you're moving slowly and Overwatching.
Anyway, Frostbite is another example of an Alien Ruler potentially horribly punishing things that usually wouldn't be a mistake.
