Force barrier is the obershield a defender gets when they get a melee kill. It is the name of the defender melee. If you get melee kills while force barrier is active you generate orbs if you have that ability selected.

I'm very well aware of that I main defender and if you pop a bubble on spawn door or group of enemies with helm of Saint 14 it blinds them, then you melee one get force barrier, then punch away on all the blinded enemies that way 2 punching isn't that big of a deal. Plus if more enemies come into it they are blinded and you can spawn an easy 15 sometimes 20 orbs inside of a single bubble (including the orbs spawned by bubble).

Yes. Titans can spawn so many orbs. Anything harder than roc playlist makes it tough to do it but using the saint and bubble would make it an option in endgame stuff. Good tip.