Now and again, when their feet knocked against something hard, they felt for the rails.

Pulled his half open and knocked hard on the inner half.

Padilla reached the front door and knocked hard three times.

The escort stopped in front of one of them and knocked hard.

He went down the steps and knocked hard on the door.

Stopping before one of the doors he hesitated, then knocked hard.

She took a deep breath at the magus's door, then knocked hard.

He lumbered to the bathroom door and knocked on it hard.

She turned to the left, weapon raised, and knocked hard.

I was next to her as she knocked hard on the front door.