To earn a gold medal you must beat the Monster Tutorial in 6 minutes. Time is very short compared to the Hunter Tutorial. Everything must go perfectly to beat this requirement. By far the toughest part is at the end when you have to fight the hunters. The most important thing here is to attack Hank (support) first. The reason being that he can cast a shield on the other hunters that absorbs all incoming damage. Now attack whoever is closest and make sure they don't revive Hank. If you want to play it safe you can also attack Hank's body on the ground to make him die much quicker. This takes a few extra seconds, but he cannot be revived after this. The best attack combo is Charge -- Leap Smash -- Rock Throw for a guaranteed kill.

There is also a 30 second cutscene at the end of the mission, right before you encounter the team of Hunters. This cutscene does count towards the total time and cannot be skipped!