3rd pic is nasty for sure, and I'm no bear attack analyzer but that doesn't look like what a bear would do to a human anyway, at least not of that size... gnawing on the leg? No, it would rip it off.
Regardless a sick story, and yes a 30-06 is NOT a bear gun. You start with a .338 Win Mag and go up from there. 450 Marlin, 375 H&H, 416 Rigby, Whalens even if you ask me