Lind did not waste time as Katara settled the formations of the war tower. Although broken down to only 3 floors, it still retained the latent potential the Heavenly Maiden Sect imbued it with.
Combined with his own weavings, they settled the cornerstone of their new base. Lind then focused on training and solidifying the foundations of their newer members.
Oz was fairly far along in life but he still had a few good decades left in him. Lind's elixirs helped both demon and man recuperate nicely.
He then focused on Ranger's Art. It was fascinating. Rather than simply relying on his own Qi, the Art used the natural shadow Qi that was found in the world.
Ranger did not understand that part of it. He had instead filled in the gaps with the easier to grasp mapping visualization. Lind taught him to look beyond his own personal Qi flowing outward and realized he was using the external shadow Qi itself.