1) i think it took place after loki fell off of the rainbow bridge and landed somewhere like hell or something and had to fight his way out without help. hela was one of the characters, and i think she and some others just watched loki.
2) in the other fic loki had been controlled by some creature and thor, frigga, and odin found out that the real loki had been killed. the thing had taken control of him before the attack in NY and the real loki was innocent. at one point i think thor found a necklace or type of jewelry that loki had (or maybe thor gave it to him.) then thor, frigga, and odin look at a memory of the creature's where it showed loki being killed. i'm not sure what happened after that though.