How did fighting teach control? It only hurt others, and part of Juugo balked at it. But he was helping, could help, and if he was right about not being able to do him harm...maybe it wouldn't be so bad. Juugo wanted so badly not to live like this, always afraid of it coming out.

"Orochimaru."

And the experiments had been almost as bad, painful and scary, but he could have endured those, if only they had helped. This was helping, though, so maybe...