Rich,
I have been listening to howls on Randy Anderson's video and I finally downloaded yours from above. I've heard coyotes my whole life but never really listened to them until now. This morning I gave it a whirl and just after first light, in an area I heard some howling a couple weeks ago, I let loose with my best lonesome howl. I got a response from what I would guess to be a male with what sounded like your aggressive sounds, several barks and some aggressive howls, from about 4 or 500 yds. Before I could respond the whole pack cut loose close by to the male for 20 seconds or so. I was able to return my best rendition of the same agressive howls but, I thought, sounding younger. I then used the KIYI. They never did show.
It sounded to me like the dominate male was telling me to "stay back" that "he was running this pack". The wind swirled on me a time or two and that may have given me away.
Will coyotes respond in much the same way that maybe a herd bull would? Giving you a response to warn you and then pushing his herd away from any threat. I know they don't always come in, but they reacted in such a text book fashion compared to your above comments that I was pumped expecting them to be on top of me. And It was pretty unlikely they were able to circle me without me seeing them. I also don't think they have been pressured by any other callers.