((That's okay ^^ I took rather a long time with this, too >>;;; ))
There! A ground, a channel, a way to heal quickly--Teva seized the opportunity, grasping Naruk's power, his strength, and keeping a tight hold on it as he began to draw the energy he needed from the Earth, via the jungle spirit's connection to it. The spirit's connection was much better than Teva's and the healing was therefore quicker than it would have been. But as for what drawing energy from the Earth is like... It's somewhat like this:
Imagine that on an island far away there is a volcano. It is miles and miles deep into the Earth, but stand at the top you can clearly see the depth of it and the width, and the glowing, boiling lava that has not erupted in a very, very long time but is no less dangerous. Across the top of this volcano, there is a bridge that you must jump from in order to reach the lava and take a sample. Of course, one does not simply jump into a volcano unless they are feeling particularly stupid that day, and so you have a friend and a good, long length of rope with you.
You tie the rope around your wait and the rope to the bridge and your friend, who is quite strong and very reliable, take hold of the rope. You climb over the railing and perch at the edge and of course you still don't jump because the sudden tension could snap the rope, so slowly you begin to lower yourself into the volcano and your friend helps. You are very careful because if you are too eager you could fall into the volcano.
That is what taking energy from the earth is like. You dip your cup in and pray that your ground doesn't let you go, because if they do you will burn with an overload of energy. This requires trust: you have go to trust your ground. Your partner. If Teva had had a choice, he would not have trusted Naruk. Nothing personal, and in fact nothing in particular against orcs(maybe they were violent, brutish, so on, but Teva's race of earth demons, too, was known for such behavior). Teva simply did not like to trust people he didn't know with his life. He would have preferred Koa or Mitya to Naruk. However, they had already begun and if the earth force that Teva could sense(the jungle spirit) trusted Naruk, then Teva could, too. He would certainly die without Naruk so there was nothing to loose.
Minutes passed in silence. The animals were quiet, and the jungle spirit was still as if she had never moved before and never would, busy keeping the links that were needed humming and open and alive. After what seemed like hours, but by the sun's telling was no longer than half an hour, Teva slowly, slowly began to make his way back. The link to the Earth began to recede and Teva's core was whole and glowing. Soon the grounding link was broken, and Teva's eyes began to flutter open. The vines in his hair had perked back into life, brilliant and green as Teva's eyes. When he spoke, it was to Naruk, for the jungle spirit and her animals were gone.
"Thank you."