Rainbow Six Siege is Ubisoft's tactical shooter released in 2015, and Frost is one of its defending operators, a Canadian JTF2 soldier known for her Welcome Mat traps. This clip comes from the Japanese voice work for the reinforcement action, literally announcing that a window is being reinforced. Short defender callouts like this spread through Siege clips and soundboards alongside other shooter callouts such as Enemy Spotted and bomb has been planted, because a one-second tactical line can be reused as a punchline in almost any defensive setup.