Billy didn't return to his friends since he could tell that something was off. It would be better if he stayed close to the monster to react in case they tried something dangerous. Billy was even considering approaching the beast more and seeing what kind of thing the creature was doing. He could tell that it wasn't moving, but he couldn't say what else. That was a problem, he couldn't let that thing surprise anyone.
"If I were a monster to be controlling a monster in this scenario, I would… shit," Billy said and then clenched his teeth.
Billy knew exactly what was going to happen, and he didn't like the idea in the slightest. In the enemy's position, he would use the lightning titan to go and make a suicide attack to kill as many enemies as possible. Billy didn't know if those titans could be revived, but he decided to assume that was the case if they were being controlled. So, using that method wasn't out of the question.