I posted a black racer I met in the woods a few weeks ago. I met this fella today on my pool deck. He had come in where there is a bit of missing weather stripping on the screen door and couldn't find his way back out. My son and I opened the door for him, left it wide open, and gently encouraged him to go through it.
He wasn't having any of that, though, and was as aggressive as I've ever seen an animal, rising up, flattening his neck a bit, vibrating his tail and striking out repeatedly at anything that got near him.
I took these photos with a 300mm lens. At one point, I had a 1.4c TC, but took it off for some of the shots.