Jack would stumble a bit once Violet let go, catching himself and making sure he was okay. He did feel weaker, and he felt the cold sweat on his forehead. His pulse was beating rapidly as his body attempted to help him, and he quickly began to run in a circle where he stood, moving very quickly and becoming a blur to anyone nearby. He could feel himself charging up as he ate three of his bars, getting some color back to his cheeks and focusing harder.
Lightning would be sparking around him and in the center of the circle. It would flash at faster intervals, continuing to spark. He would stop suddenly, dropping into a running stance. The Lightning would be swirling around him like a barrier, his strength visibly returning to his body. The lightning bolt from the center of the circle would strike him and the barrier would burst outward slightly, though not harmfully, and Jack would stand up with a smile as he wiped the sweat off his face.
"Told you I could take it."