Damn, I missed that. What was the reference?
Hal wrote it on the warehouse wall when they had to evacuate their position. He knew his father (the Professor) would get the reference and know they were not captured or killed.
Ooh! A Falling Skies and Haven crossover event!
AUDREY: "Tom Mason, your trouble is that you make everyone around you think that your family is more important than anything else, including their own lives and families."
COCHISE: "It just so happens that we have a troubles-removing device located at a hidden weapons cache two miles from here."
TOM: "Why didn't you mention this before?"
COCHISE: "The location is being heavily guarded by one skitter, possibly two."