Sueneka Sensei also said that Osensei could read his mind when he contemplated on hitting Osensei at the beach.
Still, for those that won't believe, it's not for us to tell otherwise.
As far as being normal and having supernatural powers, I believe that is entirely possible. Over the centuries, there have been many documented incidences where mothers have lifted cars to rescue their baby; people falling from multistorey buildings unscathed; etc etc. Yogi's who could hold their breath for hours, Chi Kung masters who could be beaten by steel rods without harm, psychics, esp etc etc.
If you train hard in something all your life, I'm pretty sure you can learn to do some of these things.