Lance. Dain drops his hand, relieved; that certainly explains it. It must have worked, as well, because the commander doesn't strike Dain as the type of person who would wait so long to follow through on a threat, if he was left unsatisfied.

"You're a very singular type of man," he murmurs, moving back towards the kettle. "Not many people would have made that choice, much less be able to endure it. And... not many people would have defended Tuo, either."