Although not very many people are using the special grenades (and by not many, I mean I rarely get hit with them), in time I assume we will see them in use a lot more. What I propose is to add an automatic callout for special grenades to spare friendlies from their effects by using something like "Fire in the hole!" when the grenade is thrown. An audible warning like when throwing a Flash Grenade, your avatar says in his or her nifty voice "Flash Bang!", or when a Concussion Grenade is thrown, "Concussion!", or "Subduing Room!". A different callout per grenade type would be better than a universal warning. I'm not particular about what phrase it would be necessarily, but specialty grenades are extremely useful for confusing enemies, but they often result in subduing friendly troops as well.