Isn't it strange?

"Which mark does it make?" Al asked while watching Irea nail the pin-like brick into the ground. 

"Roughly fiftieth?"  Irea replied before taking a quick look at the marks she made on one of her wooden pieces. "Fifty-third one," she added after making sure her calculations were correct.

"I think we should turn around at this point," Al proposed, turning around and looking to the south where they came from. "Traveling in a straight line might not be the best way to look for useful stuff, but we already moved far enough. There is nothing of interest here," he added with a slight note of disappointment. 

"At least we got some herbs," Irea countered, patting a small bag attached to her belt. "While not much for two days worth of walking, it's still something." She looked up at the setting sun before drowning in her thoughts for a moment.