Aye it was a different situation, one had Motherwell going 2-0 up and looking unstoppable, the other brought Rangers back to 1-1...
Forbes was onside because of
a. There were two defenders goal side of him when the ball was played across by Craigan
b. He started his run behind the ball (can't be offside if you're behind the last player to touch the ball)
The linesman had a brilliant view of the decision. He could see Forbes, but he could also see Craigan at least 4 yards in front of him... mistakes happen, that was worse than a fucking mistake. If a linesman can make a mistake like that then he should give up now and go back to his fucking day job