Taping shouldn't be necessary, defined trail and all…
7.1: Course cutting
Taking short cuts on course in order to gain an advantage can both damage the environment and brings the sport and spirit of enduro mountain biking racing into disrepute. Therefore, any rider trying to save time by choosing a line that lies outside of the defined trail will be disqualified.
The race organiser may choose, in exceptional circumstances, to apply a time penalty, not a DSQ to a rider found to have cut the course without intention. However, any rider leaving the obvious line must be aware that they risk a DSQ.
I feel extremely strongly that we as riders and racers really need to get serious about this. Racers really need to buck up and start accepting some responsibility and commit to cleaner riding, regardless of course tape. The cool thing about enduro events is that they typically use public trails, and we need to show those trails the respect they deserve, and that means not riding off trail to braid or cut corners. If you want to get super creative with your lines, enter a downhill race on a track taped with that in mind, please, but shit like this can and will affect a communities willingness to accept these events on their trails, and in certain places already is.