A canoe in the distance on a lake as seen from another canoe.
A canoe has come untied from the dock and is drifting.
We are unaware it was ever tied to be able to say that it was untied from the dock.
The canoe may not be untied and drifting.  There could be people in the canoe near the dock.
The canoe on the lake may not have come untied from the dock and begun drifting.