Holy Mackerel

As soon as Stu's finger hit the button a steady beam of light shone on the nearby wall.
Just as suddenly, the fish all darted for the beam spot.
Stu had seen this behavior before and only guessed that it would work on Mackerel!

Yeee Haaaa... He was off at lightening speed. His main concern was to keep shifting the focus point before he hit any walls!!!