Saw this on a quest near Riften today, mighty warrior go first in and then is hit and sails into the sky. Never found his body.
Tried this in an early game, it is 1-hit kill from the giant. I think I sailed from Whiterun to at least Windhelm..
The only way I can kill mammoths and giants, is sitting on a sloping hill where they can't reach you. Chicken - yeah!
How do you Heavy Dudes deal with them?


They never attack me, unless I don't heed their warning signs/come way too close, so I always leave them in peace. Besides, the giants once saved me when I was low-level and being attacked by both a hargraven (you know, sweet Moira) and a dragon, during which they took care of the latter, and the mammoths have spared me some effort multiple times by attacking bandits and the like. Besides, I can visit their camps, and even take stuff as much as I please (again, as long as I don't come too close to them), they're just too nice to my present character. If there was an achievement for "Giant Friend", I probably would've gotten it. 