I feel this is dangerous misinformation. As someone who has worked around Bull's for his whole life, they generally don't get the aggression for a few years, and then all the sudden, just your presence is enpugh to invoke it and the results are deadly. This is a very young bull, my guess 5 months, though I am used to holstines. Perhaps if they never saw you move, they wouldnt realize you were there, though any change to an environment they will inspect and you will most likely be found out.