He slumped and tottered under the force of an invisible blow.

The captain remembered the three mighty and invisible blows that had reduced the palace to rubble.

The Warlord fell back, as if struck an invisible blow.

Or as though invisible blows had lowered it, one by one.

I felt a sudden invisible blow to my chest.

Again, the invisible and completely imaginary blow to my chest.

The commissioner stooped more, as if his shoulders were sinking under invisible blows.

Then I felt a dark shuddering disorientation, and an invisible blow as if someone had placed a huge hand on my chest.

Another invisible blow caught her across the shoulders and knocked her spinning, so she fell on one knee.

Jacobs acted as if he had suddenly encountered an invisible blow.