I've heard a similar sound before at a distance.
I call it a grunt -(tic-tic-tic) - growl .
It starts with a long , low grunt , on to several rapid ticking sounds usually followed bye a running gruntal/ growl..
The tic sounds like popping your tongue in your mouth.
I've always thought it was a posturing move… doe or buck..
There was chasing going on when I've heard the sound as well.
And I think the Durury Boys did make a grunt roar growl call at one time. Maybe it was Grunt, snort , wheeze, I'm thinking of.
I can sorta Imitate it with my grunt tube also..
Never has never worked that I remember.
Not at that tone anyway.