They certainly can be intimidating.

My ex was narcissistic and thus very manipulative. One thing he would do is swagger. Yes, walk as though he were commanding attention to himself. His stance, his walk, his movements very much sent the message of 'look at me, I am king poop'. Very arrogant. If you did not buy into his manipulation he gave you the cold shoulder you-are-unworthy treatment.

So yeah, swagger and arrogant stance are definitely part of their non-verbal communication.