We explore how expert First Person Shooter (FPS) players coordinate actions using a shared voice channel. Our findings emphasize the importance of the temporality and spatiality of these tactical verbal communications (“callouts”). From here, we outline potential designs to mitigate problems in the production/interpretation of call-outs to better support coordination. Author Keywords First person shooter, FPS, CVE, coordination ACM Classification Keywords H5.m. Information interfaces and presentation (e.g., HCI): Miscellaneous. General Terms Human Factors.