"Let him discourse, if he wants to.

Ever know a scientist who wasn't primed to the muzzle with expositions?
Here, Herzog," he added, turning to the inventor, "I'll listen, if nobody else will." Undecided, Herzog smiled nervously.

Even Flint had to laugh at his indecision.
"All right, go on," said the Billionaire.

"Only for God's sake, make it brief!" Herzog, thus adjured, cleared his throat and blinked uneasily.
"Oxygen," he said.

"Yes, I can produce it quickly, easily and in large quantities.