After Jin killed 'Tellie' he went into the room without any hesitation, mainly because he already had Maqi aura sensing turned on by default. The Tactical System could have seal off his powers right at the start but what's a little cheating on the sidelines when the spectators could not identify it?
As if to trick the rest of the enemies within the house, Jin picked up the rifle that 'Tellie' was carrying and fired a shot out to the grass plains like a distraction. There were comms asking for a report but Jin continued to fire the second shot as if to create a scene that she was busy finding the enemy and not shooting them.
