Call the cops!

OK, OK. I understand that the bombing in London is bound to have some effects. It was terrible. We were listening from miles away and we were still in shock.

What I wasn't prepared for is police carrying guns at my local station. Now, I know that they're most likely to be highly trained. Trained in handling firearms safely. Trained to spot suspicious behaviour. But I'm thinking: well, suspicious behaviour is likely to include sympoms of being tense or nervous. And here's my problem: when I see a couple of coppers younger than me brandishing automatic rifles, I'm feeling tense and nervous. So I'm trying to act calm. But hang on - isn't that just what a suspect will be doing? Should I go ahead and act nervous? I can see that the magazines are translucent and I can see the rounds. Damn! I don't really like this!