I worked mainly inpatient psych with young adults and teenagers. Once we had a man react violently to an injection and he...well, I guess you'd say he was 'homicidal'. He went after another young man on the unit and the rest of the staff and patients scattered to hide in whatever unlocked room they found. I was the only staff member left on the floor and despite this man's behavior, I just had the sense he wouldn't hurt me. Looking back, I could have been seriously hurt by this guy, he was 6' tall and solid muscle, but I put myself between him & his target and even placed my hand on his chest - and if you've worked psych, you know you don't make physical contact with someone who's in a violent psychotic state unless you have enough muscle with you to take the person down. Touching them usually triggers an attack.
For some reason, though, I felt like that's what I was supposed to do, and I stood directly in front of him and put just one hand right above his heart...and for just a moment, he snapped out of it. Unfortunately, at that same time his target moved and drew his attention and the rage came back. But I kept myself between this man and his target, staying within a couple feet of him (easy strike range), but never once felt threatened myself. Even the other staff watching from the office remarked on the fact they also got the sense this man wouldn't do anything to me.
It was one of those moments in which I didn't try to overthink the impressions I was getting and just trusted them and went with it.