Jarrod and I stopped on the trail to take a water break near a large tall granite rock. Within moments we heard something big come down the trail it was breathing very fast through its nose it sounded like nothing I ever encountered in my entire life. We did not want to run but we grabbed our backpacks and we met back up with Tammy a half of mile ahead of us then I turned on the camera to talk about it when we separated ourselves from whatever it was. I spent all day hunting for Bigfoot but I think that whatever we heard earlier leaving Lake Of The Woods may have caught up to us. This experience probably was the most frightening one to date in the sierras. I didn't see what it was I shined my lights all over it was as if this thing was invisible breathing down our necks!