Very strange ...
Look at the laser beams the GB shot at Vigo right after he comes out from his painting. There are two beams, and EVERY beam hits Vigo exactly on the front side.
But when they try to catch bigger, fatter ghosts like the Scoleri brothers or Slimer, they need a lot of time till they finally hit them! They didn´t hit Gozer, Slimer, Scoleri Brothers ... but they hit Vigo PERFECTLY!
Is there a rational explaination for that?