I don't think leisurely is the right word. He just considers this a game, and the rules stated that a player can kill up to two people. He was probably reading, heard **** happening, then waited for it all to get quiet before checking in. When he saw that it wasn't Syo's handiwork, he decided that he had to bring her secret to light, so that's when he set her up.
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Xbox GT/PSN name: TatteredUniform
http://www.scuffletown.org/wp-content/uploads/2010/05/tRBE1.gif