 Rather than protecting Martin from Conrad, over the years, the descendants
Conrad's idea had been to go back in time and "eliminate!" In that way, there would be no space-drive, and, hence, the Terrestrials would never get to the other planets and oppress the local aborigines. "I wormed the whole thing out of him and all of us—the other cousins and me—held a council of war, as it were, and we decided it was our moral duty to go back in time ourselves and protect you." Induced , Martin knew, could have meant anything from blackmail to the use of the iron maiden. If one of us guarded you night and day, he would never be able to carry out his plot.
 seem to dull Martin's initially-sharp ability to be perceptive and instinctual.
 force Martin to abandon his way of life in favor of theirs, as he realizes how "good" they do have it in the future.  seem to dull Martin's initially-sharp ability to be perceptive and instinctual.  solely ingratiate Martin to the ways of future life, ensuring he will embrace their ideals.  do nothing other than wave a flag for Conrad to know where to attack upon his entry.