The beautiful Chinese woman named Xiaolan in Zhuge Liuyun's room was using a gun that was specially made, it was incredibly expensive, being a one-of-a-kind large-caliber sniper rifle in the world. The bullets for this sniper rifle were also specially made, with warheads containing a unique substance that, when combined with human blood, would produce a strange type of radioactive radiation. Although this radiation is harmless to humans, it could be detected from a great distance by a special instrument.
Therefore, as soon as someone was shot by Xiaolan's sniper rifle bullet, radioactive radiation would appear in their body, and then Xiaolan could use the special instrument to locate and capture them. This method of capture had been tried and tested, and had never failed; this was also the confidence behind Zhuge Liuyun's claim to have the strongest capturing capability.