They had no choice but to keep moving forward. Standing still for even 10 minutes meant being in mortal danger because that guy would want to attack them.
Good news for them: They soon left that poisonous area, although not before being attacked by a wave of poisonous beasts. The remaining ones were already expecting something like that, so they managed to defeat it without major problems.
As they advanced through the world's different biomes, different beasts launched themselves upon them. Some were so powerful that they swallowed many of them in one bite, but apparently, they had restrictions, so after that, they disappeared.
They were walking fast, hurried to try to get to the top quickly, taking advantage of the fact that they started from a profitable area of the mountain. But it still took them several days of continuous walking without sleep to get there.