Then he went back the way he came popped into the lab on the 3rd floor he pretended that he was going to go get Hyuga-sensei and went to the storeroom, making sure that he'd be seen on the security cameras.
[はまのまさごはつきるともよにぬすびとのたねはつきまじ, hamanomasagohatsukirutomoyoninusubitonotanehatsukimaji] (exp) the sand on the beach may disappear, but the makings of thieves never shall (Ishikawa Goemon)