Actions speak louder than words, so Leon decided to show rather than explain the process. Betty and Sasha looked at Leon, worried, but they couldn't stop him. They were aware of how inconvenient it was to live without an arm and a leg. Leon could move using earth, but it wasn't natural.
"Well... here goes nothing." Leon sighed to calm down his nerves.
This time Leon would try to regenerate his whole arm, so the pain would be much more intense and prolonged. So, he needed to prepare himself mentally. Otherwise, some unexpected things may happen in the process, causing some kind of anomaly. Precisely, Leon imagined that he would create a monster instead of his arm... Regardless, his fears didn't stop him.