I got Increased Stamina III and very seldom a problem to reach the goal sprinting and first, even when hit with some things like briars or frenzy.

Increased Stamina (or Choco Cure) will always help. Even one meteor won't kill you off (though of course can be a prob, if you are the only one it hit, because of the debuff).

Quote Originally Posted by SokiYagami View Post
Which reminds me, as of now there's no way to refresh a skill at level 50 yet, are there?
Don't know for sure, but normally not, since you only get a new skill when leveling up.