 How did Jery act differently with Anders?
MASTER SPY OF THE RED PLANET Jery Delvin had a most unusual talent. So when the Chief of World Security told him that he had been selected as the answer to the Solar System's greatest mystery, Jery assumed that it was because of his mental agility. But when he got to Mars to find out why fifteen boys had vanished from a spaceship in mid-space, he found out that even his quick mind needed time to pierce the maze of out-of-this-world double-dealing. For Jery had become a walking bomb, and when he set himself off, it would be the end of the whole puzzle of THE SECRET MARTIANS—with Jery as the first to go! Oddly enough, it worked out, and he now does nothing else. He says, "I'd like to say I do this for fulfillment, or for cash, or because it's my destiny; however, the real reason (same as that expressed by Jean Kerr) is that this kind of stay-at-home self-employment lets me sleep late in the morning." "Jery Delvin?" said the one on my left, a note of no-funny-business in his brusque baritone. Yes," I said, some terrified portion of my mind waiting masochistically for them to draw their collapsers and reduce me to a heap of hot protons. Security men were not hired for their loquaciousness. Honest, sober, civic-minded, slightly antisocial...."
 he was much more commanding than usual
 he was more helpful than usual  he provided more detail in his answers  he was better at observing and noticing things  he was much more commanding than usual