"I'm thinking electric fence if we can hit the sweet spot with the voltage." It isn't elegant, but it could free him up to do some heavy lifting instead of heavy stomping. "You wouldn't have to maintain it continuously, just juice it up for waves."

He points over her head to a pile she might not be able to see from her height. "I spotted a bunch of rebar I'm gon--"

He stops talking and grimaces as he spots another wave incoming. "Hang on. Cover your ears for a second."