Unless Arc Blade is charged, the only option I have against the bubble is to run away. The Titan just places it down on your control point and you're -blam!-ed. Shoot him with a shotgun and it takes off 1/3rd of his blue shield. Can't take too much skill to survive. As a Blade Dancer I've been killed by one shotgun blast and a melee, or been reduced to a sliver of health by a fusion rifle shot.