C989 River of Red!

On the other side.

After leaving the field, Duane continued to stroll around. At the same time, the corner of his mouth curled up into a smile as he muttered to himself, "He must be feeling very uncomfortable right now, right?"

That's right.

He was purposely giving the antidote to Marcus Zouch.

Back then, in the cave in the Valleyford Peak of the Valley