[{quoted}](name=Aeolian Melodies,realm=NA,application-id=3ErqAdtq,discussion-id=7l0esEAV,comment-id=0000,timestamp=2016-03-20T21:32:16.168+0000)
Tagging allies extends the duration of the aura, but each ally can only be tagged once per aura cast. So if you press Q, and tag all 4 teammates very quickly, the aura is extended, but you can no longer apply it to your allies since they've been touched by it once. Same for the shield and MS buff.
I am aware of the time added and the limit of once per ally. The issue i am trying to bring up is that there is a small time period where the aura is still visible, but you can't tag an ally who has yet to receive the bonus from the aura.
It would be like is Bard's portal took a brief moment to "decay" when its time was up. For a brief moment it looks like you should be able to use it, but clicking on it does nothing. Sona currently has a thing where the particles for her auras remain/decay for a brief moment after their timer is up. This make it very awkward when your aura fails to effect a target despite the visuals looking like they should still work.