I was there yesterday afternoon and the bird was behaving normally, alert, healthy, actively foraging in the leaf litter and seemingly very tolerant of human encroachment, moving away on foot when a photographer got too close (around 10 metres). I saw no baiting, thankfully. The bird was moving in and out of cover but eminently photographable- I even managed some pictures with my telescope and phone camera.
I am in no way critical of individuals yesterday, everyone was restrained, if a little anxious to get the best shot. I think the anxiety leads to a gradual creep towards the bird to get the "best" picture, ultimately disturbing the bird.
I certainly hope this was down to natural causes- and down to a shrike, not a human.
Dylan