After talking with Rooster Teeth, Microsoft agreed, remarkably, to let them use the game without paying any licensing fees at all. In fact, the company later hired Rooster Teeth to produce ''Red vs. Blue'' videos to play as advertisements in game stores. Microsoft has been so strangely solicitous that when it was developing the sequel to Halo last year, the designers actually inserted a special command -- a joystick button that makes a soldier lower his weapon -- designed solely to make it easier for Rooster Teeth to do dialogue.