Johnny must come down at once--or if he would not do that, at least he must fly lower.

Did Johnny mean to commit suicide?
For answer Johnny grinned and went higher, and the face of Schwab became not mottled but a sickly white.

He sat gripping the edges of the cockpit and gazing fearfully downward, save when he turned to implore, threaten, and command.

He would report Johnny to his employers.

He could make him sorry for this.