Glitched Alduin (first time you fight him) so that he was invulnerable. That fucker wouldn't taje any damage, regardless of what I did! And it wasn't like the glitch fixed after dieing once, no no no. When I understood that I simply couldn't hurt him, I checkedoine to see if any others had experienced the same thing. Quite a few had. Eventually I had to reload a save 2 hours back and do it over again.
As for non-glitched boss-fight... I dunno.








