One I took today. The chopper looked like it was coming straight at me while wobbling side to side and was only about 40 foot above me when it went over and landed about 120 foot away. Thought it was in trouble at first. Turns out they were responding to an incident. Made the walk in the park more interesting.
http://s30.postimg.org/mv4jsena7/chopper6.png
http://s30.postimg.org/m31vt7j35/chopper5.jpg