I've heard (and seen) that when they've detected you, that "aggressive" bark let's EVERYONE know that THERE'S TROUBLE A-FOOT... But, you CAN still get some of them, IF you're PATIENT...
My friend, Chuck, and went coyote hunting last fall. We were about 75 yards apart, on opposite sides of a wide (dry) creek bed. Chuck usually does the calling when we're together (he's MUCH better at it). The basic idea is, he sets 'em up and I knock 'em down. Works pretty sweet...
ANYWAY... We'd barely got in place, and a coyote starts barking to the south. We couldn't see him. How far? I'm guessing 300 yards to a 1/4 mile (who knows).
Chuck starts calling anyway. About six or seven minutes later, I spot a coyote approaching from the WEST, about 300 yards out. It's on Chuck's side of the creek, following the sound of his call... I follow it in my scope... It gets to about 180, and stops (raising his nose to get the scent). That's where we picked him up. He was in the crosshairs when he stopped, and was DEAD 1.5 seconds later.
THE POINT IS, whether this was the one that BARKED at us or not, HE CAME IN AFTER THE BARK. It's NOT impossible, but NOT LIKELY.
It's worth the effort to stay for a while and TRY. You've already invested the time and energy to make the stand. See if it will pay off. Don't just automatically "call it a day". YOU NEVER KNOW FOR SURE, just don't get your hopes up.
It IS, afterall, "Coyote Hunting".
Good luck to us all...
70Tactical