Stop making excuses. You Assistants just need to up your game FFSTotally agree @RustyRef . More generally, looking at still images will always make the decision seem WAY easier / more obvious than watching a full speed video. Worth bearing in mind that on a typical 'crossover' offside call, the defender can easily be running out at 5m/s and the attacker going a similar speed in the opposite direction. Therefore the overall picture can change by at least one metre in a tenth of a second .....