Had built a fresh road into middle of nowhere the year before. I had set a bear bait 20 km up road then prob 30 km by quad into bush. I had been baiting it once about every two weeks due to time to get in. I had set up a tree stand 15 yards from barrel, barrel was chained to a 6-8” aspen tree , the bears had been there lots and had a small depression dug under barrel from licking up molasses. On this trip up I brought my tent trailer to camp by road , got it set up then quaded in to Rebait Barrel for next days hunt. When I got to where I park my quad I grabbed a bag of oats over one shoulder and bucket of molasses in other hand and walked 100 yards ( my rifle and bow on quad still) through some thick aspen regrow to the bait site on the edge of trees with small river 100 yards away in valley. When I get to site ( making noise whole way). I walk past my stand and look ahead to bait , no barrel ? Walk closer no chain? Closer no tree just hole where roots dug up. Now I’m scratching my head wondering what’s going on , standing over root hole . When something starts roaring down by river at me ( never heard a black bear or a moose make that sound) super loud .I start backing though the aspen towards the quad briskly, the roaring continues towards me keeping about 60 m from me , I can see the aspen shaking as it follows me. When I get to quad , I bolt a shell in my rifle and lean over my quad aiming at direction trees shaking. Trees shook and roaring kept up for a couple minutes( felt like longer) , then silence. Got on my quad drove back to camp , packed up went home and never came back . Tree stand probably still in tree. That was 25 years ago. Maybe it was a grizzly ? Heard they released the odd problem bear up there , maybe they roar like that. Had tremendous power to rip a 6-8” aspen tree out of the ground .