GMAB is obviously QUITE a talmid chochom. Ants are QUITE hard to see, and you are walking anyway. On Shabbos, this would incur the ptur of Psik Raisha Dlo Nicha Leh, or Misasek. After all, no one here said that it’s OK to walk as you wish during the week, but that you need to be extra careful on Shabbos. Apparently, it is only killing if it is a “Harigas Machsheves”.
Too bad only one person can be the kohen godol and wear bells on his hem…..