3 - Trigger on interrupting target's spellcast

What is the enhancement in mind? How should it look and feel?
Another type of event should be triggerable on -- when the player interrupts the target's spellcast. (It is already possible for GemSay to trigger when somebody interrupts the player's spellcast.)

This probably would imply that there should be an available variable of some sort for inserting the name of the interrupted spell into the message.