Nothing 'lucky' about the offside. It was offside. We have been lucky in not conceding another one though, with some unforced errors (Mings, Traore). It has been pretty one-sided for a lot of the half and they've looked like scoring, whereas we've looked toothless.
I don't think we've been as poor as some posters seem to have, but we will need to keep the ball and probably score another one to get something I think.