User blog comment:Pauldin91/Garp has Haoshoku Haki/@comment-28966845-20160923122619/@comment-1940096-20160925020624

Never noticed that. It was in the manga too. Electricity and the shockwave are shown when Haoshoku Haki and Busoshoku Haki are combined as shown every time it has been seen. Well actually it's just the electricity. The shockwave is from Haoshoku.