Shawn's heart gave one quick thud, as he hadn't expected anyone to speak back to him in such a place.
"So I've often thought myself," Shawn said calmly enough, but his heart had decided one quick thud wasn't enough and began to gallop in his chest.
She heard quick thuds as Buddy raced upstairs.
There was a succession of quick close thuds.
The pony bolted again, the quick thuds of its flight scarcely faster than the rhythm of her heart.
But he saw it with a quick thud of his heart.
Wolf felt his heart give a quick thud.
My heart gave a few quick thuds as it shifted into worry mode.
Next moment Dinah heard a startled gasp, a cry of indignation, then a sudden scuffle and the quick thud of running feet fading into the distance.
A small quick thud and then nothing.