You just asked your little brat to turn left from his current position while you were not sure whether he will understand it or not. To your surprise, he not only understood it but also took the left turn as per your command.
What you need to know:
Your kid has started to develop the understanding of directional commands, which he might have either learned from school or observed you while walking or speaking. This is a great leap towards his development as you can be more relaxed while walking with him and telling him where to turn around if he is a few steps further from you.