If I were snowmobiling and I came across a bull moose who was on the same trail and traveling the same direction I was, there's pretty much no question what I would do: I would stop the snowmobile. And maybe turn around. Or at least wait until the moose had some time to get away from me. Because tailgating a moose doesn't seem like a super smart idea.
Granted, I don't really have any personal experience with moose encounters, but I know they're big wild animals who can't be counted on to be like, "Oh, a human in a loud vehicle's chasing me, tra la la, I see NO reason to defend myself." Based on the viral video of two snowmobilers being charged by a pissed-off moose near Jackman, Maine last Friday, I'd say these creatures are no different from many parents: THEY JUST WANT THEIR PERSONAL SPACE, DAMMIT.