As Offal acts in 268, the western wall of force disappears. Offal flies all the way to 105n30e-5z (with her front claws in the VZ) and breathes a cone of repulsion gas at Uri, heightened by +6 on the DC. Offal is still invisible, and although Offal didn't notice you casting see invisibility or anything like that, you get an AoO at very close range if you have the means to see her.