Asgard was calm and the golden city shone in the night, a beacon to all those around it. The end of the rainbow bridge remained in its shattered state, the queen refusing point blank to allow it to be repaired. She mourned for her lost son and Odin didn't have the heart to deny her wishes.
If one had been watching the bridge that night, then one would have seen the subtle changes in the sea around it before a bright blue sphere of light appeared, two figures standing inside it and holding a tube of some sort. On closer inspection, once the light had faded, one would have seen the small glowing cube in the tube, blue lights flickering across its surface. Having looked that close, one would have also seen that the second man, clothed in black and forest green, wore chains on his wrists and a gag, made of tough material, perhaps metal, and securely fastened, preventing his jaw from moving at all. Once one had observed this, perhaps one realised this was beyond you and slipped away into the city as the tall blonde man in armour, red cloak over his back, led the black haired man with the green cloak back towards the city and on towards the soaring towers of the castle.
Thus it was, Loki Laufeyson, returned to Asgard to face the judgement of his adopted father Odin. The God of Mischief had come home.
