The old man looked at him as if just noticing his presence.

It took a few seconds for them to notice his presence.

No one would notice its presence until it was far too late.

They moved away from me, not noticing my presence behind them.

In fact, they have apparently not even noticed our presence.

If anyone else noticed his presence, they gave no sign.

I stopped to listen for a moment, until the large man noticed my presence, then moved on.

It was at the third attempt against me that the king noticed my presence, and I heard him call the man away.

She noticed my presence and, for once, spoke before I could.

"Tell me if you have any reason to believe the humans in your party noticed our presence."