During Cloning Target AP with FLUXION , the Real Wifi Is Working Perfectly??

Wifi only can hack with fluxion if and only if the victim is sign in our clonned ap. If their real wifi is working perfectly, how will they signup ? I Can't Deauthenticate the target at the Same Time . Is That Happening Because of Having Only one NIC? Can I Solve This Prob by Using an Additional Usb Wifi Adapter. Or is there any other solutions.??