As of patch 1.1, whenever my characters talk or make sounds during battle, they seem to overwrite anyone else that was previously talking or casting a spell. This can happen with short lines like Pallegina's "Belfetto!" or even someone's groan for swinging a weapon. The vocals being interrupted seems to happen moreso to player created characters (my Watcher) than the companions like Eder or Pallegina. This didn't seem to happen at all before the latest patches.
Also, for my Watcher (male Wizard), spell incantation sounds "Athek werthan roth!, etc." rarely play at all anymore for him during