No one great enought

These little mistakes followed for another 10 tries, until Luke finally understood what he was doing wrong.

"I only need to create one beam, just one electrical source. I'm creating several" Luke said.

It was as if hundreds of small rays were thrown out of the sword, with that amount, a magic circle as simple as the one on the outside of the sword would never be able to control this attack. 

Luke then began to channel more energy, but this time, he visualized a single gigantic bolt of electricity coming out of his sword. He visualized the weapon shooting that lightning bolt as if it were a rain cloud attacking the earth from the sky. 

The lightning flew out of the sword, and finally Luke was able to control it the way he wanted. It took the form of a dragon, as it flew around wherever the half-wolf wished. That dragon burned the four test dummies that were in the front row, completely exterminating them.