this instant
at this instant
at the instant

At the same instant I saw her big black eyes.

At the same instant I saw her fall to the floor.

But at the same instant, she was through the door.

Every person in the party saw it at the same instant.

The others all started to speak, then stopped again at the same instant.

He almost did but, at the last instant, bit back the words.

At that instant, the light in the room went out!

They turned to face forward again at the same instant, and ended up looking into each other's eyes instead.

The report fell in at the same instant of time.

At the last instant he tried to pull out of the way.