Sounds like a great idea. (I used to teach English as a second language too.)

This reminds me of what was probably the best foreign-language lesson I ever had, out of many years of studying several languages. The teacher played an actual tape recording (tape, yes, this was 32 years ago) of a cop stopping a driver for speeding. It's noisy, cars are whizzing by, it's hard to hear. They are saying "uh" and interrupting each other and mangling their syntax like people do in real conversations. She played it over and over, and each time the class discussed (in the foreign language, of course) what the cop and driver had said until most of us understood the whole thing.

I don't play WoW so I can't help you but hopefully other people will.