Trying to make AI

i am trying to make a game where you protect a hear from viruses and i want to make a white blood cell that homes in and attacks the viruses but they all attack the same one please help

here is a link http://www.flowlab.io/game/play/1051963

Proximity (Turn repeat on) into ‘point at’ into velocity forward.
Put proximity into what you want to chase

WOW @MagmaDude100 i never knew that!