An anti tank rifle in her arms and Tellie's experience shooting airplanes while moving. Granted the movement was even more drastic than previously, but unlike the previous time, both Tellie and the Tactical System had data. Besides, what they are hitting now were attack helicopters facing them and unloading their arsenal of missiles and bullets onto them so when compared to their fight against a fighter jet, this was slightly easier.
Not to mention the upgrade cards were no doubt catered to Tellie's use of her rifle. "Higher Parallel Processing, better stability, higher penetration, increased precision and stronger grip" were the upgrade cards used in order to defeat the attack helicopters. With one quick breath, Tellie managed to shoot down not one but two attack helicopters that were within her sights.
