I had imagined a callout/ emote wheel/list you can pull down use and assign your favorites with hotkeys. Something similar to the battlefield 4 order wheel, holding down a button and getting a full list of in game actions or callouts, and after all the guardians aren't mute so it wouldn't be unreasonable for them to speak during fights. For example maybe a new player could have the option in a fight to call out for any other guardians in the area for assistance if their having trouble, or telling other players to "sit back and watch how it's done" because they want the challenge. It would also be a simple replacement for the lack of actual chat, Allowing for some rudimentary communication.