Now because has done the creating of the shadow I am not entirely sure what the actual steps he had took but, from the image what he has done is made a light spear as the characters child so this semi dark grey-ish, shadow would be following where-ever the character would go.

Please refer to his blog that I have attached to the blog where I have introduced about his input.

Sam’s Blog: https://samsgamesdesign.wordpress.com/blog/?fbclid=IwAR07QoCC7QOc5kZMN3Ayba-JNSGsE6_M7SYiPrxgP9aB0Jpdk4ByCIFtbug