Fear_tutorial_1_простая геометрия, самое начало file - F.E.A.R.

In F.E.A.R An unidentified paramilitary force infiltrates a multi-billion dollar aerospace compound, taking hostages but issuing no demands. The government responds by sending in special forces, but loses contact as an eerie signal interrupts radio communications. When the interference subsides moments later, the team has been obliterated.