Comment on "Correct definition of the Poynting vector in electrically and magnetically polarizable medium reveals that negative refraction is impossible.".

Physically valid electromagnetic continuity equations can be generated from either the usual form of the Poynting vector E x H or the alternative E x B form. However, the continuity equations are not identical, which means that quantities following from E x H cannot always be compared directly to those from E x B. In particular, the work done on the bound current densities are attributed differently in the two representations.We also comment on the negative refraction condition used.