  First-person shooter (FPS) game tournaments take place across the globe. A
growing number of people choose to watch FPS games online instead of attending
the game events in person. However, live streaming might miss critical
highlight moments in the game, including kills and tactics. We identify how and
why the live streaming team fails to capture highlight moments to reduce such
live streaming mistakes. We named such mistakes jarring observations. We
conducted a field study of live streaming competitions of Game For Peace, a
popular FPS mobile game, to summarize five typical jarring observations and
identify three primary reasons that caused the issues. We further studied how
to improve the live streaming system to prevent jarring observations from
happening by doing semi-structured interviews with two professional streaming
teams for Game For Peace. The study showed that a better system should (1) add
a new sub-team role to share the director's responsibility of managing
observers; (2) provide interfaces customized for three roles of live streamers
in the team; (3) abstract more geographical info; (4) predict the priority of
observation targets; and (5) provide non-verbal interfaces for sync-up between
sub-teams. Our work provides insights for esports streaming system researchers
and developers to improve the system for a smoother audience experience.
