It required for Lith to anticipate the life force's flow, so he could place the energy on its tracks and connect the threads a second earlier they collided. There was no space for mistakes, each procedure could only be a success or a failure.
So far, he had failed a lot. The hole in Kalla's abdomen was the size of a human head, while her paw had enough life force to fill a space ten times as big. Yet it was already almost depleted.
To use what little energy was left, Lith used Invigoration before every attempt to fix the flow. It increased his odds of success at the expense of his endurance. With each use of Invigoration, the smaller was the effect and the higher the burden on Lith's body.
Each burst allowed him to use his full focus as he had just woken up from a good night sleep, and to deplete his mana without worries. Soon, he started bleeding from his nose, then from the ears and lastly from his eyes.