Comment on "Computer simulations on sprite initiation for realistic lightning models with higher-frequency surges" by T. Asano, T. Suzuki, Y. Hiraki, E. Mareev, M. G. Cho, and M. Hayakawa - Campos, Leandro Z. S. [UNESP]; Saba, Marcelo M. F. (Amer Geophysical Union, 2009)