Moose had that look that Julia Roberts had in Sleeping with the Enemy and that Jody Foster had in Panic Room, when cops came to the door, and the perps standing out of view had them at gun point, telling them what to say. Both characters had to appear to look calm and tell the cops "No, everything's okay. I don't know anything," while pleading with their eyes that everything's NOT OKAY.
Face it, we've all heard repeatedly over the past year these same phrases about "resiliant Americans," "threatening our freedom," etc. Moose has heard these phrases and he knows we've heard these phrases. HE KNOWS WE'LL UNDERSTAND WHAT HE'S SAYING. He's telling us this is TERRORISM, be it domestic (unibomber) or foreign (ME).
In that case, blink in Morse code. Three short, three long, three short, will get the message across...