User blog comment:Endless Exceptions/Ritz, The Discordant of Sound/@comment-5174430-20120717021415/@comment-3475363-20120718160226

The damaging AOE field persists the time that is left when Ritz did not channel.

i.e. When Ritz channels for 1 seconds and then stops channeling because


 * an interruption is caused by an enemy (stun, silence etc.)


 * by moving


 * using another skill.


 * using a summoner spell.


 * using an item active (i.e. zhonya's hourglass)

the AOE field will persist for 4 seconds.

So if Ritz channels for 3 seconds, the AOE field will persist for 2 seconds, etc. etc.