I can't say for certain that being out of the saddle will help with this particular root. But in general, body bike separation cam aid in your stability. It allows you to shift your weight around the bike as needed and to act as a shock absorber. I find it much easier to react to technical terrain when I'm out of the saddle, especially if I manage to keep relaxed and loose. Even when I feel my bike slipping, I've been able to save myself.

But that said, tire pressure and wet leaves and roots can make things tough. There's no shame in avoiding the section for the time being and building your confidence back up. I freaked myself out last fall by riding in heavy leaves on a relatively new bike. I spent all winter doubting myself. I think it can be a tough time of year to ride, as gorgeous as it is.