The situation I posted above literally happened. A Titan did the super on the Warlock, then the Warlock came back to life, killing the Titan. They shot down a Hunter to my right while I was activating my Arc Blade. I jumped and used blink, going past them and killing a Hunter behind them. I turned around undamaged and sliced the Sunsinger. They turned around as well, and killed me with their melee. I had shield and health both up. Sunsinger is by far the most OP super when used by someone who knows what they're doing.