All I have to say really to this is that sometimes since I play as DPS the most, is that some scenarios I will focus on damage above all else. If I need to clench some extra damage and the fight is getting tougher for whatever reason and Healers are wearing out and Tanks are looking weak, I'll find a spot to bunker down in and let whatever hits me hit me besides OHKO moves and the like. At that point I won't help other people, dodge as many attacks, or really worry about anything besides the main target. If it's me and one or two others alive, I'll ignore all the people dying and try and finish it myself.

Suppose you could call it Tunnel Vision, I just see it as "well I need to get this done now or never, screw whoever can't keep up."