Running After

Opportunity doesn't always knock. The time will come that the expected doesn't happen. Sometimes it just walks on by.

You'll be standing there, knowing that opportunity is about to pass, waiting on it to knock. You may even unlock the door, thinking it might just try the door without knocking and you don't want to miss out. Then, silence.

Is that when you're supposed to run out and try to catch it? Is that allowed? That's got to be some sort of karmic taboo.