Tiger beetles are such fast runners that they can capture virtually any nonflying insect  However, when running toward an insect, the beetles intermittently stop, and then, a moment later, resume their attack  Perhaps they cannot maintain their pace and must pause for a moment' s rest
but an alternative hypothesis is that while running tiger beetles are unable to process the resulting rapidly changing visual information, and so quickly go blind and stop
In pursuing a moving insect, the beetles usually respond immediately to changes in the insect's direction, and pause equally frequently whether the chase is up or down an incline.