I want to mention the classic concept of "Slayer/Skirmisher" pairs that I'm sure a bunch of you are familiar with! One players tries to start fights with opponents while staying alive (the Skirmisher), another player finds active fights and finishes them off (the Slayer).
Generally, the moment an opponent looks at you, you're the Skirmisher, and you've gotta stay alive and act in a way that wins the fight, and that includes "staying alive and letting your teammates swoop in on them". Playing in this way leads to great coordination, but what if you happen to always wind up as the skirmisher? You spent an entire match going into fights with a teammate, but the opponents ALWAYS looked at you instead of them? It's nice to know the game says "Yes, you were doing your job, too!"
And as mentioned, weapons like Dualies and Brellas love to make Skirmishing their Plan A rather than feeling it out, so they gotta get what they deserve!