What an easy way of getting it away unseen!

With no chance to fade away unseen, The Shadow had held his ground.

She made another involuntary gesture, as though to drive something unseen away.

And they were there all day, until dark, when they could slip away unseen.

"But how could we collect all that stuff and get away unseen?"

If the visitor had been announced, she herself could have slipped away unseen.

The men get away unseen, but a police manhunt quickly begins.

If they were ever to get away unseen, that was the very moment.

Until that happens, most of the birds will fly away unseen.

They were panicking as it was their lack of observation which had led to the two getting away unseen.