Swamped

You think it looks like a breather mask. Your first instinct is to glance around for the person you spotted with a mask strap earlier.

It looks like they've got a hand on their chest. So they might be getting ready as well.

And they're sitting down next to the old lady. You're not sure what that means. But you have a bad feeling about this. You pull the mask out of your pocket and put it on carefully, trying not to draw attention to yourself.

What you're beginning to suspect is that the booing was a signal. An indication that something had gone wrong. Maybe the informant played a role in it, or maybe it was sheer coincidence. You don't really have a way to know.

But if your guess is right, whatever happens next is the backup plan. And it involves masks. You could wait for it, since your own mask should protect you, but you can't be sure how safe that is. So maybe you should be a little more proactive.