Well, see, the hairy thing about all these "what-ifs" and "what would you do" hypotheticals, and even the "what I dids", are that they aren't universal. What works for him, may or may nor work for you, certainly won't work for me . . . etc. because we are all different people. Our mannerisms, our personalities, the way we look . . . an infinite number of variables play into why some things work for some people, and won't for others.
But to add something meaningful to the conversation. . .
At the last NTI event, during the Simunitions event in ATSA village, one Practitioner did something that worked very well to de-escalate a situation. The scenanio goes as such - the Practitioner is blinded (simulated) by a chemical release and has to make his way to the 1st aid station. He is given a face shield the Staff had buggered up badly that almost entirely obscures his vision. A Role Player (an infirm woman) will lead him to the area if he allows her to help him. On the way, a few men playing the role of VCA's will initiate an encounter with a "bump", and the scenario plays itself out from there.
This particular Practitioner allows her to help him make his way, and the men begin giving them both grief. He clamly and without shouting, states in a clear voice, "Why don't you just leave us alone." He wasn't aggressive, but he was assertive. And it was enough that all the Role Players, and the Judge, concluded that he successfully de-escalated the situation via a firm, confident presence. You could clearly tell he did not want to fight. But he conveyed the message that, even while blinded, he would be a tough adversary if pushed into fighting.
Sure, some will counter its role playing. And other suggest that its not "real". But the Practitioners in the Villiage, even to include an experienced combat Marine veteran of Vietnam who went on to retire from a large Metropolitan police force, and now trains thousands professionally, stated that being blinded in that scenario was absolutely terrifying. And the responses we deliver in Simulated Force on Force will mirror what we do during the "real thing".
I suggest the best way to learn what will work for you is to try it in a quality Force on Force training, with good, experienced Judges and Role Players available to give you feedback on your execution.