Just remember that if the shooting team violates, they are losing that FT, regardless of whether B violates as well. If you get the double violation, it remains a simple loss of the FT on the first of two (or First/second of three), AP arrow if it was a FT that could be rebounded. It is kind of odd on the initial FTs that the double violation only penalizes the shooting team - maybe we should flip a coin to see if they get to re-shoot the first FT
