The surrounding area all of a sudden went from light and sunny to pitch black. To John he found that very weird, and it came down to that it may be a genjutsu. So, John grabs out a kunai from his back pocket and and slices the left side of his cheek, the cut isn't too deep but deep enough to release him from the what seemed to be a genjutsu. Light was all around, and no longer in a pitch black room.
That was a little too obvious, really?
Standing there, having a hard time getting used to light again thanks to that annoying genjutsu. John didn't want to take any chances so he send sound chakra to both his lungs and his ears, creating a solar effect so every time he took a breathe the soundwaves would bounce of things telling John where everything is, and as well his ears could now hear pretty much everything. John heard something as soon as he used this technique, something above him he could hear the whistling of sorts due to it falling from the sky. So grabbed out another kunai and threw it directly above him, and once doing that he heard a his kunai and whatever Minato threw connect can fall to both sides of John.
Sneaky.
Next John merely just grabs out about 30 kunai and just begins to throw them 10 at a time until they are all gone.