Read the following paragraph and extract the answer for the question: What was the name of the person whose heels were badly frost biten?

The party made good initial progress, travelling around 15 nautical miles (28 km) each day. The dogs ran so hard that several from the strongest teams were detached from the traces and secured onto the sledges to act as ballast. In their wolf-skin and reindeer-skin clothing the men could cope with the freezing temperatures while they kept moving, but when they stopped they suffered, and barely slept at night. The dogs' paws became frostbitten. On 12 September, with temperatures down to −56 °C (−69 °F), the party halted after only 4 nautical miles (7.4 km) and built igloos for shelter. Amundsen now recognised that they had started the march too early in the season, and decided they should return to Framheim. He would not risk the lives of men and dogs for reasons of stubbornness. Johansen, in his diary, wrote of the foolishness of starting prematurely on such a long and historic journey, and of the dangers of an obsession with beating the English.On 14 September, on their way back to Framheim, they left most of their equipment at the 80° S depot, to lighten the sledges. Next day, in freezing temperatures with a strong headwind, several dogs froze to death while others, too weak to continue, were placed upon the sledges. On 16 September, 40 nautical miles (74 km) from Framheim, Amundsen ordered his men to push for home as quickly as possible. Not having a sledge of his own, he leapt onto Wisting's, and with Helmer Hanssen and his team raced away, leaving the rest behind. The three arrived back at Framheim after nine hours, followed by Stubberud and Bjaaland two hours later and Hassel shortly after.  Johansen and Prestrud were still out on the ice, without food or fuel; Prestrud's dogs had failed, and his heels were badly frostbitten. They reached Framheim after midnight, more than seventeen hours after they had turned for home.Next day, Amundsen asked Johansen why he and Prestrud had been so late. Johansen answered angrily that he felt they had been abandoned, and castigated the leader for leaving his men...
user
Prestrud
assistant