Two hybrid monkeys jump out of the window after Crusader, and two of Crusader's clones that were inside the building follow them. When they're outside, one of the ways they've evaded tracking this long becomes obvious to the bot: at least some of them seem to have evolved a very advanced form of camouflage, quickly taking on the properties of their background (though it seems not quick enough when they're actually running around). That, coupled with their very low body temperature, coupled with Brockton Bay being a big city, meant that they could effectively stay out of sight most of the time.