Always:I was charged by a Cougar ONE time while hunting deer.  Back in the 70's & 80's I hunted  deer  and elk in the deep woods.  Where the logging roads ended I would start walking in  and  go deeper in  another 5-10 miles packing in, sometimes staying for 4 days.  Never saw any other hunters.  Hunting was Excellent.  I saw all of the wildlife the deep woods has to offer.  I know I was stalked by a Cougar on numerous occasions, but NEVER saw them.  I did see plenty of Cougar tho down in canyons or on the slopes etc. Usually if I was up wind of them and they got a sniff of me they would take off.  ONE time I was  charged by a Cougar.  I came around a steep rock wall, and I heard a snarl.  I looked ahead 20 yards, here was a Large Male cougar on a fresh deer kill.  He laid  on the deer kill with his ears back,  eyes zeroed in on me, mouth open and showin his teeth and snarling.  I immediately raised my rifle, the cougar charged, I fired a warning  shot to his right, fortunately (cont.)