Talk:Execute/@comment-83.249.226.135-20190103105829/@comment-192.246.224.104-20190103141945

It's because you're using a surge to suffer 1 fatigue damage. Suffer is the keyword here, you can suffer any amount of fatigue from card abilities and effects that then convert to health damage. Your hero cannot actively push beyond their stamina limits unless they're suffering fatigue such as Runic Knowledge (RK).

Execute requires you to push your hero to use their well of stamina up rather than suffering fatigue. That's, more or less, the reason you can with RK but not with Execute.