When they are doing circles around me checking me out it's as easy as point and shoot.
When they freak and start swimming away ad dive down fast and take off behind them with fast smooth kicks. At some point they will slow and turn to one side for a better look at you and BAM!!!
Macks and my favorite fish to shoot.
Edit.
Ahh I see I should have watched the video first. They say the same thing I did about don't stop swimming behind them and they will turn and give you a shot.
That guys voice. I couldn't get passed the whole which gun thing.