^
Damien: Come down from your ivory tower you old goat!
Zandalor: O_o
Damien \_/
Zandalor: O_O
Damien: \_/
Zandalor frown
Damien laugh
Zandalor: \_/
Damien :|
Zandalor Hold your tongue villain! How dare the scourge of Rivellon show his face here! You shall pay yet for the atrocities you've committed!

http://www.youtube.com/watch?v=cGNFDcNpx_o&feature=player_detailpage#t=98s

I see no problem with this dialogue. If there was an interrupt feature, it would have to be where your character interrupts in some way.

Let's Play Divine Divinity - The Damned One's Tale - Chapter II.