I now understand the mid-super part but after A titan uses their super i cant shoot them until they are standing again.
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I primarily play as a Titan and I've used my super many time just be killed by a player that noticed me just as I was using. Oh man it pisses me off when I go to use my super just to die mid smash without doing any damage at all. So no titans are not invincible when they use their super there's a skill that make them tougher when they use their super but it didn't work for me as well as I thought it would.