The instructor was landing the aircraft in a crosswind from the right. As the speed reduced, during the landing roll, the aircraft began to veer to the right. The instructor applied full left rudder and brake in an attempt to maintain directional control, but the aircraft continued to veer off the strip. Being concerned that the aircraft would strike a fence and overturn, the instructor applied full power in an attempt to clear the fence and land in an adjoining paddock. The aircraft cleared the fence but subsequently stalled and was blown back against the fence.