Speech semaphore
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The speech semaphore restricts talkers' ability to talk.
By default, there are two semaphores: friendlies & foes (based on IsPlayerAlly). See GetSpeechSemaphore in ai_speech.h
If UseSemaphore returns true, only one friendly and one foe is allowed to talk at a time.
If UseSemaphore returns false (whether based entirely on code or on spawnflags), the talker can interrupt other talkers.
Note:Any interrupted talkers will continue to talk.