It was an outing gone wrong, Rose had been trying to do some Christmas shopping for the upcoming feast with her family when S.H.I.E.L.D. showed up and things escalated into a firefight. Torchwood intercepted and between her and her small group of elves who had been hiding in the shadows of the busy streets, chaos quickly ensued.
It was one god and her eight allies against Fury, Romanov, and ten other agents who ambushed them, and things weren't looking good for SHIELD.
There was a sudden flash of light and in the middle of the street appeared a figure much to the surprise of both fighting sides. Upon getting a closer look Jack realized it was a young man no older then 18,that was when their priorities changed a little. But it wasn't just Rose and Jack who noticed, Fury did as well and was already barking orders to the agents to try and get the guy out of the area. It wouldn't be difficult as the civilians had already fled the scene though with some minor causalities.
Jack was concerned that since the blond in being so exposed, Fury's snipers would take him down due to how he appeared, and giving no regard for his own safety since he was immortal, he rushed out shouting "Hey kid! Run!"