Smashing free, he quickly cut down two jotuns who had been left to guard, and opened the Bifrost for Thor and his friends. Locked in his icy prison, he was helpless to prevent Loki leading one of them into the city, but he was soon galvanised by the calls of Thor who was still trapped on Earth. Heimdall was still frozen when Loki brought several jotuns through the Bifrost. Heimdall responded with an immediate attack, but Loki simply froze him in a block of ice before the blow could strike. Enraged, Loki dismissed Heimdall as a subject, thus releasing the protector of the Bifrost from his vow. Although he grudgingly accepted, Heimdall opted to only observe a literal interpretation of his vow to Loki and did not interfere when Sif and the Warriors Three used the Bifrost to reach Thor. Later, with Thor banished and Odin fallen into his Odinsleep, Loki placed himself on the throne as regent and demanded Heimdall’s loyalty.
