You already know that to be hidden is the most important thing for each assassin. Each chameleon covering costs too much of time. And you have not so much of time. You must be quick , you must assassinate and leave. So mighty assassins discovered camouflage ability , which allows you to turn into chameleon more properly and more quickly - it sounds really well - of course. But nothing is for free. Moving with extended camouflage costs much more of energy. But it saves time. In prompt as %ac

See also: chameleon