He was always the one receiving orders and only giving them on extremely rare occasions but here he was talking to the captain of a squad and the captain refers to him as a 'sir'. He had been fighting everything in him just to prevent himself from saluting as soon as he saw the rank difference.
This wasn't even just a rank difference; each soldier here was tall… likely within an 8-9 feet range and then they all carried an incredibly intimidating aura around them. They were all naturally intimidating that he had to put in extra effort not to bend to them.
Calling his own troops to assist the soldiers, the man gave them their space. Lord Kingsley had made it clear that each squad was more than capable of taking care of themselves and only needed just a few permissions from him to do certain things.