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Anyone controlled by others would most likely seize the chance to escape, and those who wouldn't are fools. So it's logical for a spy to think of escaping, and there's nothing wrong with that. The mistake, however, was that he underestimated the people in the ward.
There were four people in the ward, three of them assassins and top-notch at that. The other wasn't as skilled but was still a Dragon Bodyguard, all of them formidable characters. If the spy could have escaped under their watch, he would have made a name for himself, and they would have had no face to go on living in this world.
Thus, although the incident hadn't occurred yet, the outcome was already predestined; the spy would not only fail to escape but he was also going to get a beating.