Her frozen expression vanished so quickly that no one else would have seen it.

The worried expression on her face vanished when Wally ran through the gate.

Her happy expression vanished when she looked at Sam.

Immediately, Max's angry expression vanished, crowded out by one of concern.

Then the expression vanished, and he was grave, almost respectful.

Then he shook his head, and the blank expression vanished.

He looked up again, and the old expression vanished, but in that brief moment of - what was it?

Then the expression on her face slowly vanished, replaced by a blank mask.

A slightly haunted expression sketched across her face but just as quickly vanished.

For an instant, his face seemed to cloud, but then the expression vanished.