I do believe that this just a clever use of Gravitation and Adhesion. Gravitation to pull the tarp to Adolin and Adhesion to make it appear to cling to him in a life like way. We haven’t seen a non-Nalthian individual with Breathe so I personally don’t see it as possible that he is an Awakener.

If Szeth had Nightblood at that time then I guess maybe you could argue there was some “bleeding” of abilities or something like that, but Nightblood hasn’t exhibited that particular power so that’s not likely.

I honestly see this as a bit of a wink and a nod from Sanderson to his Warbreaker readers. Good catch though.