I think it was Duel Nature after they got his Gramps out of the hospital & perked up w/Tanya’s blood. While they were at the farm Gramps & Lenny thought he could do EFPs with his aura by clapping his hands together. He’s used the EFPs to great effect in several books after that. Now that I think about it, didn’t he clap his hands on one of the demon witches devil dogs when they attacked Owasos? I think he’s done it once or twice since then. The last one I can remember with just his hands was in Winter Fall fighting in China. It’s not a full body crush like Okwali did though.