I was just in a Clash match that ended badly for my team. The enemy team i think had 4 titans all with the defender subclass. They went to the middle of the map about a third of the way through the game with complete access to heavy weapons and special ammo cases on the Black Shield map and proceed to infinitely spam the Defender's Special one after the other, resulting in Four Shields up at all times. This was only possible due to the fact that the shield spawn Special Orbs and the fact that we could not kill anyone within them while they had free reign to step out and kill us at while with the shields only a step back. I found this to be a bad fit and our team only got ten more kills together in that match, due to one player roaming on the enemy team.
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Thats like exactly how the bubble is supposed to be used in pvp, it lets you take and hold ground safely to put pressure on the enemy team. As someone who plays titan a lot this sort of thing is how you win games as defender, its just 9 times out of ten the enemy has two gunslingers who just pop your bubble without even thinking about it and murder you.