On my way home from a frustrating 2 weeks in Colorado... We were on bulls the second week, and they were loud bu we tried absolutely everything and couldn't get close enough. Hunting a big valley and at camp we would hear them all day and were 99% sure they were down by the creek but they would shut up whenever we got close, either calling or just stalking (with perfect wind and after a rain-completely quiet). Only bulls we saw were ones we glassed across the valley up high. So my question, did the bugles really come from up high but sound like they were coming from the bottom, then when we got to the bottom we couldn't hear them because of the creek?