"I... will... not... serve you!" - Bolvar Icecrown Citadel flashbacks.pic.twitter.com/G8PWrnY2Oe
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I remember there was a quest in the WOTLK, where that time Arthas tormented Bolvar. And that is where they took the VO there. When I rehard the same sentences, there is no doubt the VO is the exact same. There is no way someone be able to do the same voice and with the same rythm
It wasn't 100% the same though it could've been because they removed the echo effect. And even if they did re-use it, who cares? Plenty of other games and other media have done that to save time and resources.