sources:
http://irowiki.org/wiki/Rune_Mastery
http://www.divine-pr...base/item/12726(explicit statement of re-use delay)
http://www.divine-pr...pertz-runestone(another proof of stating re-use delay)
If it's truly bugged,
would the below be possible fix?
After-Cast Delay Fix:
In db/re/skill_cast_db.txt
Spoiler