After the Heliport fight, fresh tag holders stand on the D-E, C-D and B-C bridges, and Normal has a second holder in the Strut A Pump Room. Take them on this loop, before you go into the Shell 1 Core. The hold-up works as before: from behind with a gun drawn, then step to his front and aim at his head (or groin) until he shakes. A guard who won't give in can be wounded once in an arm or a leg with the suppressed SOCOM and aimed at again. The Thermal Goggles show a tag on a guard who still carries one.