I was doing some tests...

1. If anyone is in the range when it starts, it will last and persist as long as they are in the circle.
   • Duration refers to how long the chorus circle lingers, not the buff itself.
   • By the time the circle vanishes, and if the person or enemy has not left, the buff ends, without applying #2.
   • Anyone who was not in the circle during its creation will not be penalized with #2 or #3, but will receive the buff like anyone else as if it was first created.
2. Effects will continue to persist for 10 seconds upon leaving the circle.
   • This included enemies under the effects of Sonata of Sorrow (Because Sorrow Sonata sounds weird to me...)
   • If at any point, a person decides to leave because they were knocked out, used Assault Slash, or simply walked out, the 10 second rule is applied.
3. If the person decides to go back into the circle, they will regain it, only to have it vanish after the circle disappears.
   • This included enemies under the effects of Sonata of Sorrow.
   • This also means that #2 can not occur again and it will not be refreshed for another 10 seconds.
4. Entering another Chorus Circle will override the previous Chorus Circle.
   • If it overlaps, then the recent one is applied.
   • The 10 second rule is applied only to the initial buff. Entering a higher or lower ranked circle will not refresh it.