Are we going to get an emote for "Thanks for the [b][i]help[/i][/b]. Now please quit following me and stealing my kills."?
Or how about an emote for "Do you care that you're interfering with the spawn of the enemies I need?"
English
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You can deny their request to join your fireteam. Otherwise, it's just like regular Destiny. If people are "stealing your kills," you'll unfortunately just have to go somewhere else.