Thanks Speed 12 - caught me as well. As I was imagining your situation I thought he'd frozen or lost comms. Didn't occur to me the he didn't have the vocab.
It hits home sometimes when you are talking shop and someone is not a pilot. Then you have to keep backtracking, thinking about whether the words make sense in normal conversation and then interpret for the non aviator. Worse, when they know some of it but not all !
Also, find dangerous discrepancies between different pilot backgrounds: ex-mil or not; northern or southern hemishpere; JAR/ICAO/FAA.