I had been playing sound in "steamsound" using GAP Game Audio player. I telling you that I used PC.
Have you heard any party member speaks when his/her hit points is low in gameplay? I use GAP to scan it but another dialog sound won't work, I had to use miles tool player to play dialog. When I play one of file I heared Mission's voice "I'm hurting....... pretty bad" when her hit points is low, I guess. some of sound had played in game like set mine but I don't heared any of my Party member when she/he disabled mine. That must be bug in game, right?
But if you play it on XBOX, tell me, did you hear voice of party mebmer when hit points is low?
The sound probably only plays when you switch to the character or are controlling that character. Cause, when you switch characters (Tab, for the PC version), they say stuff.